there are several posts on t2 vs 6.5..
ccmfactorydirect i believe is the name of the official ccm ebay store. much better to call them and talk to mel, she is a great person to talk to. i feel bad everytime i call them because im pretty sure i talk too much.
if you plan on selling the gun anytime soon, dont buy new. i bought mine new, and i dont plan on selling it unless i quit paintball. ccm in my opinion is the best pump gun you can buy today. used or new, you cant really go wrong.
finally, TEST GUNS OUT. everyone can say that a certain set up is the greatest thing since sliced bread, but to you it could be crap.