Fresh 2.0
CyanogenMOD
DamageCONTROL

Those are best, but fresh 2.0 is my favorite, all 3 have live wallpaper support, cyanogenmod removes flash (for web browser) but has JIT! enabler, damagecontrol also has JIT! but you have to disable htc sense to use it, annoyingly, fresh 2.0 doesn't have superuser, it has some weird equivalent, so i recommend updating that to superuser 3.0. on cyanogenmod, you have to install a weird .zip file in order to get android market, web browser, etc. Fresh 2.0 has a different style dock (Which i prefer, actually) JIT! will work if you use a different launcher as your home-screen (launcherpro, androidmate {my fave}, helix launcher, openhome, pandahome, etc.)

I only know this cause i used to have the exact same phone, message me if you need more info

EDIT: and by the way, cyanogenmod is actually based off of froyo