My favorite is a tie for Harmonia and PA 2.99, which just came out yesterday. Beautiful ROM, and seems rock solid so far, plus MMS receiving works which is what I pretty much need.
On Harmonia, I usually run as close to stock as possible, and add the Friendstream/Facebook widgets back in. On PA, I've been running as close to CM10/AOKP/AOSP as possible, don't really like tablet mode too much.
Harmonia Pros- Rock solid stable, everything works
Harmonia Cons- (for me) Sense, slow compared to AOSP builds
PA Pros- CM10 BASED! YES! JELLYBEAN! EXTREMELY FAST! Pretty stable
PA Cons- No MMS sending (easily remedied by using imgur links, almost everyone has smartphones nowadays), small bugs here and there