I've always been impressed with CyanogenMod ROMs. They always have tweaks and very cool features not found in other ROMs, yet it's not all loaded down with useless crap. They are very smooth and fast with the right kernel.
All incarnations of CyanogenMod have played well with my OG Droid and now my Dinc, allbeit, it is even better with my Dinc. That's not to say there aren't other excellent ROMs - there are a few other *elites* and some very good ones out there - but something about CyanogenMod resinates with me. I was a *ROM-whore* when I had my OG, flashing everything that came out, then going back to CyanogenMod, but with my Dinc, I'm staying with CyanogenMod. Just waiting for them to put the finishing touches on Gingerbread, and then I'll be ALL OVER IT!