i5 750 + asus p55 is the way to go !
Unless you want to save 20$ and may be upgrade to a 6 core processor that doesn't even beat an i5 750 (unless if you do programmation stuff and editing(which I'm sure you don't.).)
This is my thought, with a 30$ aftermarket cooler you may reach 3.5-3.8 ghz with a low voltage with this chip !
It's up to you, I'm not saying am3 is no good, but I say 1156 might be better for the present.
thank you very much i
i do some searching and i thing i will take your advise especially if you know that in my country i5 750 + asus p55 is cheaper !