I'm relatively sure that is cache/memory-related, as I managed to reproduce a crash 3 times straight in the same point (loading of an exterior cell, then teleport to another, then travel to another (outside Chorrol), and then entering Chorrol....it always crashed when entering the city), where if I saved just outside Chorrol, and then restarted the game, I could enter the city without any problem.
Anyway, my load order is:
Spoiler
Oblivion.esm
All Natural Base.esm
Cobl Main.esm
TamRes.esm
Better Cities Resources.esm
HorseCombatMaster.esm
ScreenEffects.esm
Unofficial Oblivion Patch.esp
Oblivion Citadel Door Fix.esp
DLCShiveringIsles.esp
Unofficial Shivering Isles Patch.esp
Better Cities .esp
TamRes.esp
All Natural.esp
All Natural - SI.esp
PowerAttack Voicemod - The Shivering Isles.esp
All Natural - Real Lights.esp
WindowLightingSystem.esp
Book Jackets Oblivion.esp
diversegrasses.esp
ImprovedSigns.esp
VA_BetterGold.esp
Willful Resistance.esp
Enhanced Economy.esp
DarNifiedUI Config Addon.esp
DropLitTorchOBSE.esp
MyPersonalArmy.esp
Oblivion Graphics Extender Support.esp
Spell Delete.esp
Map Marker Overhaul.esp
Map Marker Overhaul - SI additions.esp
Book Jackets DLC.esp
MaleBodyReplacerV4.esp
javrmb.esp
KohdiScimitar.esp
PureSteelBlade.esp
ROADMasterOutift.esp
RTFemaleReplacerV12.esp
Shdw_Armor Set_Sotonhorian.esp
Slof's Boners! v5.esp
VA_GlamdringSword.esp
Cobl Glue.esp
Cobl Si.esp
Cobl Tweaks.esp
BladeOfTheHaunted.esp
BladeSong.esp
CreditsVideoBladeSong.esp
DarknessHollows.esp
DescentIntoNecropolis.esp
Dwemer Ruins.esp
EM_RedRoseManor.esp
Guardians of the Nine - Akatosh Chantry.esp
HentaiLovelyHouse.esp
Lem - The Nether.esp
Silvercliff.esp
Skyrim Nord Tombs.esp
Slof's Oblivion Goth Shop.esp
SunderedKeep.esp
TheForgottenRealm.esp
Apachii_Heroes_Store.esp
Fort Weye.esp
GuardsofCyrodiilRedux.esp
ElsweyrAnequina.esp
ElsweyrAnequinaFemaleBody.esp
TalosBridgeGateHouse.esp
xuldarkforest.esp
xulStendarrValley.esp
xulTheHeath.esp
XulEntiusGorge.esp
xulFallenleafEverglade.esp
Anequina-Fallenleaf-Patch.esp
xulColovianHighlands_EV.esp
xulChorrolHinterland.esp
xulBeachesOfCyrodiilLostCoast.esp
xulBravilBarrowfields.esp
xulLushWoodlands.esp
xulAncientYews.esp
HentaiLovelyHouse2-AncientYews patch.esp
xulAncientRedwoods.esp
xulCloudtopMountains.esp
xulArriusCreek.esp
xulPatch_AY_AC.esp
xulRollingHills_EV.esp
xulPantherRiver.esp
xulRiverEthe.esp
xulBrenaRiverRavine.esp
xulImperialIsle.esp
TalosGatehouse + ULImperialIsle.esp
xulBlackwoodForest.esp
xulCheydinhalFalls.esp
xulAspenWood.esp
xulSkingradOutskirts.esp
xulSnowdale.esp
ApachiiHeroesStore-Snowdale patch.esp
xulCliffsOfAnvil.esp
xulSilverfishRiverValley.esp
ImpeREAL Empire - Unique Forts.esp
ImpeREAL Forts + Silverfish River Patch.esp
Castle_Seaview.esp
CastleSeaview+LostCoast Patch.esp
Castle Wolfspike2.esp
Fort Akatosh Redux.esp
Real Lava 1.3.esp
HUD Status Bars.esp
DecoratorAssistant with OBSE v1.1.esp
Improved Fires and Flames - Increased Sound.esp
Quest Item Tag Remover.esp
ScriptIcon_Replacer.esp
Enhanced Vegetation [125%].esp
CayoArtaria.esp
TheKillingMoon.esp
Level Based Health.esp
ClaimThatInterior.esp
Smite of Order.esp
MidasSpells.esp
FearsomeMagicka.esp
Spells Be Effective.esp
EnchantmentRestore.esp
Mounted_Spellcasting_Deadly_Reflex_Compatible.esp
S.P.A.M. 100+.esp
SP1stPLegs.esp
CompanionshipRing.esp
1em_Vilja.esp
CompanionMaster.esp
Better Cities Full.esp
Better Cities - VWD of the IC.esp
Better Imperial City.esp
Better Cities - All Natural.esp
Better Cities - Unique Landscape Barrowfields.esp
Better Cities - Unique Landscape Chorrol Hinterland.esp
Better Cities - Unique Landscape Cheydinhal Falls.esp
Better Cities - Unique Landscape Skingrad Outskirts.esp
Better Cities - Unique Landscape Imperial Isle.esp
Better Cities - No LEYAWIIN Flooding.esp
Script Effect Icon Changer OBSE.esp
DeadlyReflex 6 - Combat Moves.esp
Cobl Silent Equip Misc.esp
Bashed Patch, 0.esp
All Natural Base.esm
Cobl Main.esm
TamRes.esm
Better Cities Resources.esm
HorseCombatMaster.esm
ScreenEffects.esm
Unofficial Oblivion Patch.esp
Oblivion Citadel Door Fix.esp
DLCShiveringIsles.esp
Unofficial Shivering Isles Patch.esp
Better Cities .esp
TamRes.esp
All Natural.esp
All Natural - SI.esp
PowerAttack Voicemod - The Shivering Isles.esp
All Natural - Real Lights.esp
WindowLightingSystem.esp
Book Jackets Oblivion.esp
diversegrasses.esp
ImprovedSigns.esp
VA_BetterGold.esp
Willful Resistance.esp
Enhanced Economy.esp
DarNifiedUI Config Addon.esp
DropLitTorchOBSE.esp
MyPersonalArmy.esp
Oblivion Graphics Extender Support.esp
Spell Delete.esp
Map Marker Overhaul.esp
Map Marker Overhaul - SI additions.esp
Book Jackets DLC.esp
MaleBodyReplacerV4.esp
javrmb.esp
KohdiScimitar.esp
PureSteelBlade.esp
ROADMasterOutift.esp
RTFemaleReplacerV12.esp
Shdw_Armor Set_Sotonhorian.esp
Slof's Boners! v5.esp
VA_GlamdringSword.esp
Cobl Glue.esp
Cobl Si.esp
Cobl Tweaks.esp
BladeOfTheHaunted.esp
BladeSong.esp
CreditsVideoBladeSong.esp
DarknessHollows.esp
DescentIntoNecropolis.esp
Dwemer Ruins.esp
EM_RedRoseManor.esp
Guardians of the Nine - Akatosh Chantry.esp
HentaiLovelyHouse.esp
Lem - The Nether.esp
Silvercliff.esp
Skyrim Nord Tombs.esp
Slof's Oblivion Goth Shop.esp
SunderedKeep.esp
TheForgottenRealm.esp
Apachii_Heroes_Store.esp
Fort Weye.esp
GuardsofCyrodiilRedux.esp
ElsweyrAnequina.esp
ElsweyrAnequinaFemaleBody.esp
TalosBridgeGateHouse.esp
xuldarkforest.esp
xulStendarrValley.esp
xulTheHeath.esp
XulEntiusGorge.esp
xulFallenleafEverglade.esp
Anequina-Fallenleaf-Patch.esp
xulColovianHighlands_EV.esp
xulChorrolHinterland.esp
xulBeachesOfCyrodiilLostCoast.esp
xulBravilBarrowfields.esp
xulLushWoodlands.esp
xulAncientYews.esp
HentaiLovelyHouse2-AncientYews patch.esp
xulAncientRedwoods.esp
xulCloudtopMountains.esp
xulArriusCreek.esp
xulPatch_AY_AC.esp
xulRollingHills_EV.esp
xulPantherRiver.esp
xulRiverEthe.esp
xulBrenaRiverRavine.esp
xulImperialIsle.esp
TalosGatehouse + ULImperialIsle.esp
xulBlackwoodForest.esp
xulCheydinhalFalls.esp
xulAspenWood.esp
xulSkingradOutskirts.esp
xulSnowdale.esp
ApachiiHeroesStore-Snowdale patch.esp
xulCliffsOfAnvil.esp
xulSilverfishRiverValley.esp
ImpeREAL Empire - Unique Forts.esp
ImpeREAL Forts + Silverfish River Patch.esp
Castle_Seaview.esp
CastleSeaview+LostCoast Patch.esp
Castle Wolfspike2.esp
Fort Akatosh Redux.esp
Real Lava 1.3.esp
HUD Status Bars.esp
DecoratorAssistant with OBSE v1.1.esp
Improved Fires and Flames - Increased Sound.esp
Quest Item Tag Remover.esp
ScriptIcon_Replacer.esp
Enhanced Vegetation [125%].esp
CayoArtaria.esp
TheKillingMoon.esp
Level Based Health.esp
ClaimThatInterior.esp
Smite of Order.esp
MidasSpells.esp
FearsomeMagicka.esp
Spells Be Effective.esp
EnchantmentRestore.esp
Mounted_Spellcasting_Deadly_Reflex_Compatible.esp
S.P.A.M. 100+.esp
SP1stPLegs.esp
CompanionshipRing.esp
1em_Vilja.esp
CompanionMaster.esp
Better Cities Full.esp
Better Cities - VWD of the IC.esp
Better Imperial City.esp
Better Cities - All Natural.esp
Better Cities - Unique Landscape Barrowfields.esp
Better Cities - Unique Landscape Chorrol Hinterland.esp
Better Cities - Unique Landscape Cheydinhal Falls.esp
Better Cities - Unique Landscape Skingrad Outskirts.esp
Better Cities - Unique Landscape Imperial Isle.esp
Better Cities - No LEYAWIIN Flooding.esp
Script Effect Icon Changer OBSE.esp
DeadlyReflex 6 - Combat Moves.esp
Cobl Silent Equip Misc.esp
Bashed Patch, 0.esp
...and my system has 4 GB's of RAM, Windows 7 SP1 64-bit + the Oblivion.exe 4 gb-patched'.