Its all speculation at this point so hard to say...
Currently you would go
q6600 or e6750
4gb and vista 64bit
But in 2 months we should see some penryns (both wolfdale and yorkfield) AMD will release Phenom and also R670's and NVIDIA is "supposedly" changing 8800 lineup to slot the 8800GT in better $/performance so its anyones guess in 2months.