My vote is pretty much along the lines of the group here...
B4 Lost City - I've owned the module three times between 1984 and 2011 - I'm keeping the one I have now! LOL
The Sentinel and the Gauntlet - I always wanted to play these but never had the chance. I owned them both in the 80's and wished I had them now. I'm still on the hunt for them if anyone knows someone that wants to trade some modules - let me know!
Against the Giants would be awesome. This is the second time I've owned that one - I tried to run it in the 90's and it started out good, but the group fell apart.
Temple of Elemental Evil - same as above! I've owned it twice, and don't now, but wish I did!! Tried to run that one in the 90's also, but group fell apart.
Honestly, I'm good to play any