I've had great luck with SSK's, but I've tried almost all of 'em on here with varying degrees of enjoyment and frustration. If I had a top 3, it'd be:
1) SSK - simply out of the box runs best on my Verizon TP
2) Psyki - Clean, love the system font, but uses more memory than SSK's.
3) Energy ROM
After that, I give an honorable mention to Raidzero's as his uses the least memory and is pretty stable, but I like Manila...
Demolition's ROM is fun to play with as it is bleeding edge, but not as stable as the ones above by any stretch.
This is subjective based on my opinion, but I can say that I've flashed my phone more times than you can imagine LOL
Good luck!
Mark