Currently using Cyangenmod RCI-6 with "Black Glass" theme. Just came from Kangerade, and for my first itme using it, I have to say its fast. Before Kangerade, I always stuck to UD roms, but Jrummy's and Cyangenmods are fast and stable as well. UD was too plain for me. For Cyangenmod 6, I'm using its stock kernel and its running fairly fast...haven't bothered flashing Chevy's kernel yet.
I recommend using Chevy's 1.2 or 1.25 low voltage kernels. They work awesome-ly and have great battery life.