Just stick with the 940 that is not a worthy upgrade with your 940 OCed to 3.6 GHZ like you have it performs the same as the 965 the 965 may OC a little higher but it isnt worth it. If you want an upgrade wait for Thuban and upgrade to that.
I see you have yours OC to 3.6 Ghz so probly not worth it. The 965 with the C3 revision will break 4 GHz but 400 Mhz isnt worth $180. Your board will support the new X6 phenoms which should be released shortly. Were I you, I would look there for your next drop in cpu upgrade.