Along with Asus, Gigagbyte, and DFI you can also look over MSI, Abit, and eVGA for some good boards. Regardless of make some boards will tend to be better OCers for any plans in that area. Plus the type of build you have in mind there.
I was trying to decide between the DFI 790FX-M2RS and the BioStar TPower N750
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2010200022%201070930149%201071036145&page=1&bop=And&Order=PRICED
As far as quality Abit and MSI have pretty cheap AM2+ boards, even MSIs top end AM2+ 790FX is pretty limited on bios options compared to DFI-Asus and Gigabyte. And I dont even think EVGA even makes a AM2+ board.
Mine has more options than my brothers Asus M3A32, and I've used both, and mine was $40 cheaper.
Point noted! When looking around for Asus substitutes some time back and even more so recently since Asus seems to be slipping in the last few years I have been considering the few others like Gigaabyte, MSI, DFI and Abit as most likely.
In the last 2-3yrs. it seems Asus popular for gaming builds often has been letting some bad boards out on occasion. Either they come in doa or quit on you in a brief period of time. The features and what is usually supported were the main note however.