you're right, you don't need a 990FX motherboard, but at the same time, you don't want an old 880...i'd say a 970 board is what you're looking for. I'd vote (again as i often do) the Asus M5A97 R2.0. I run this board myself with a modest overclock and it's great. There is a more budget version of it (M5A97 LE R2.0) But i wouldn't recommend it for a couple reasons: 1. No VRM cooling, which you'll definitely want for any overclocking 2. Less power available to the CPU with a 4pin instead of 8 pin.
Asus boards have excellent build quality, great warranties, and are backed by a very good service department