GingerBeast
Depends on what you want. If you want Sense, then I'd recommend Virtuous Unity (it's gotten rave reviews). It has Sense 3.0, which is found on the Sensation.
At any rate, you'll find several others here.
I'd recommend reading up on this before you get started.
Good luck.
I wound up with Virtuous Unity. VERY nice! I'd like to put different wallpapers on different panels. Is that possible? If yes, how?
Finally, I hope. I'm going to try Android Revolution HD. Has anyone tried this one yet? Any pitfalls to watch out for?