People have been using the CM Hyper 212 EVO and been reaching 4.5 Ghz territory with ease.
The Corsair HX750 is a good PSU. Its modular and 80 plus silver (meaning it would be on the higher end of efficiency). I'm not quite sure what you mean by better though. You mean more efficient or better in delivery of power?
I was looking for new motherboard since they stoped selling the old one in the store
so far i found this: MSI P67A-GD65 (B3) ( http://goo.gl/oZydV ) what do you think of it and do you know any better mobo around the same price? Thnx