Please, do not include Shivering Isles, because I consider it a must add.

Let's go!

Battlehorn castle
Horse Armor Pack
Knights of the Nine
Mehrunes' Razor
Orrery
Vile Lair
Thieves den
Wizard's lair

And if you use a mod to enhance those dlcs, let me know!

My favorites:

1. Mehrune's Razor

2. Wizard's Tower

3. Spell Tomes

4. Thieve's Den

5. Vile Lair

6. Knight of the Nine

7. Fighter's Stronghold

8. Orrery

9. Horse Armor

Knights of the Nine is a good series of quests and just fits perfectly into Oblivion like no other DLC does. And the lore for it is the sort that TES IV really needs; it feels lacking without it. I'd give Kot9 a 7 overall, which seems kinda low for what I just said, but the actual gameplay is not spectacular. It's just good. There are enhancement mods for it, but I don't use any.

Orrery I consider to have balance issues, plus I just don't like having copious amounts of Greater Powers, so I'd rate that a 2 or 3 (aside from gameplay, the Dwemer orrery itself is pretty).

Mehrunes' Razor is neat. I can't remember it that well but I remember the quest interiors being really fun to sneak through. The reward itself is nothing special, but then artifacts generally aren't with enchanting available. Maybe I'd give this an 8; does what it's meant to really well, but nothing to wow you like SI does.

None of the others I really make use of at all.