I have been to the nexus to get the mods I have now. I was hoping people would list mods they like so I can check them out. And maybe add them to my game.
You could do worse than to check out the first several pages right here, checking out the [Relz] (i.e., release) threads that sound interesting. Of course, you would be missing lots that way, but you would still pick up many fantastic mods, and the latest versions of (and warnings/advice for) them as well.
Also, the Mod Psychics and Mod Detectives threads (probably more the former, in your case) are very useful, generally speaking.
Personally, other than what you already have (and in a few cases,
in place of same), I would recommend: Bomret's Shivering Isles texture pack, Hi Res Oblivion Realm Textures, FCOM, All Natural, Race Balancing Project (RBP), Less Annoying Magic Experience (LAME), Better Cities, Really Almost Everything Viewable When Distant (RAEVWD) with all the addons, Unique Landscapes (all of them, with all patches, etc.), Persuasion Overhaul, Reneer's Guard Overhaul, DarkUId DarN, nGCD, Progress, Cobl, Enhanced Economy...
(phew!) And so many more... (that's just what comes to mind currently.)
But I really don't know what you'd like, so it's hard to say for sure.
edit: Whatever else you do, make sure you install Wrye Bash, BOSS, and the latest official and unofficial Oblivion patches, at the very least.