I would suggest a trip over to 68forums.com. There is a ton of excellent information on everything rifles, parts, ammunition and hunting.
Look for SPCII chambers and twist rates no faster than 1 in 10. Most proponents are advocating a 1 in 11 or 1 in 12.
When you know what you want, a trip to ar15.com 's Equipment Exchange is a good place find awesome deals.
Daniel
Austin, Texas