AMD's latest mb chips are the 970 , 990X , and 990FX
They perform the same and just add features
Motherboards with a 970 chipset start at around $75
[ asrock call some boards 970 but they have 770 chipsets so read the specs as well as the title ]
ASUS M5A97 LE R2.0 AM3+ AMD 970 $75 after rebate
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131872
is an excellent choice