Well for starters, if the 460 you had was bottlenecking your cpu, these other three cards are going to bottle neck even worse. I would suggest you looking into a newer cpu. Theres a few good choices with the amd platform that wont choke up on a newer gpu.
i dont know if that 460 hawk was bottlenecking my cpu or not , but its fans broke.
if my cpu doesnt bottleneck 7850 then i wud go for it , else i hafta buy i5 and waste my money which i dont want