Well

I heard by my friend DFI was really good products for the overclocking ... well i checked and the nf590 are not really buggy well.. the people on newegg will never said good comments only bad ... well Example for M2N-E from asus lol ! Bad overclocker (MY ASS LOL !) I can do an overclock of 800 MHz with an stock cooler ^^ Well ... Now for the cpu well now i think the best cpu for the price is the AMD Athlon X2 6000+ @ 3Ghz Per core for 300 bucks(Canadians lol) are the best choice

Well it's depends of you
But you can take the Asus mobo too asus stuff are good too
Well another question you want an AM2 platform?