Newegg currently has a promo on the ASRock 970 Extreme3, $90 with a $40 rebate, which seems pretty great. You'll definitely want to avoid most, if not all 760G chipset based boards.
That said, are you being given the CPU for free? I would strongly advise against buying a CPU released in 2012 on a platform that has been dead for almost 5 years, in 2017, unless you're getting a screaming deal.