Well I bought a Barton 2500+ from GameVE.com and they guarentee a AQXDA0322 which I am using. I got it to 2.2 GHz @ 1.8V and another guy got the same stepping to 2.4 GHz @ 1.85V. So far, its been pretty good. Although you may want to check out newegg, seems like most people there are getting the AQXEA0323 or something cores that are good too.