I currently use this one:
http://forum.ppcgeeks.com/showthread.php?t=98327
It is the official 6.5 release except it is for US Cellular so you will need to run some provisioning cabs for whatever provider you have. I have converted mine over for Sprint and it works better than any of the ROMS out there in my opinion. Mainly because it is bare bones with no fancy stuff added in.