Make sure you read the instructions here
http://forum.ppcgeeks.com/showthread.php?t=43266
You have to read the first post of that rom and it should tell you if it's 6.5 or 6.1.
MightyRom5, Juicy7, Psycki, StarRom are all 6.5. Those are just a few of them. I think MightyRom5 is a good one. Try it out. Good luck and welcome to ppcgeeks.