My suggestion
1. if you don't have insurance on your device, get it
2. Read this
http://forum.ppcgeeks.com/showthread.php?t=42503
3. Once your phone is unlocked, choose a rom. My suggestions are mighty, juicy, nrgz, bored and jmz
all of them make really good roms, NRGZ is loaded but it is very VERY fast (drawback is battery life though)
a. for speed, silence rom and cfay roms seem to be the fastest followed by scrosler's rom
b. for loaded program rom, NRGZ is the best
4. Have fun with a great new device (or a device with a new rom on it)