I'm fairly sure I have a similar number in BG2.
Hell, I have over 300 hours in ME2 ;D
Dragon Age: Origins
265.3 hrs on record
This includes Awakening hours, I imagine, since they run off the same executable. I apparently really liked DAO.
Fallout: New Vegas
143.3 hrs on record
Mass Effect 2
116.6 hrs on record
I guess I should spread those TF2 hours to other games.
i've got about 180 in FNV, 100 in FO3, 100+ in Morrowind, 100+ in Oblivion, about 200 in Guild Wars, another 50 in the expansions, probably about 150 in dragon age
the game with the most amount of hours though? probably Street Fighter 4. I have about 300 hours in that game (well, if you combine SF4 and SuperSF4)
back in the day i spent a ton of time in starcraft, fallout 1-2, TIE Fighter, and a bunch of other games, but i didn't keep track of time back then so i have no good clue as to how many hours I actually spent on those games. Actually, I just realized that if you add up all the times I've played FF7, Planescape Torment, and Deus Ex, you probably have over 300 hours each.... hmmmm
My FF7 hours have got to be up there. I remember a summer where I would replay it weekly.
Phantasy Star Online probably has a fair number of hours. I impressed myself when I got my first character up to 100 hours.