I also ran UD...then all the Drama...
So I ponied up and purchased the Rom Manager Premium and switched to Koush/Cyanogen...ran Several of the Cyanogen based ROMS for a little while.
I liked the Cyanogen/Clean Looks Rom the best. I had no issues with heat or batterylife. No real force closes and it had some nice features built in.
I am now running the Chaos/Redrum/Clean Black (I was itching to try something new). The chaos development team is SUPER active on this forum. Bgill55s Clean black is my fave theme..the Redrum is not to shabby either.
Anyway...you can't go wrong with either Cyanogen or Chaos. Both are solid and quick.