I don't have time to read any professional reviews, but you should. Thus,
1) Decide on budget (all about $150 to $200)
2) ensure 4x6/8-pin PCIe
3) modular, semi-modular or non-modular
4) Wattage? (all should be fine)
5) Read reviews
It supports up to SIX, 6/8-pin connectors. Here's a quote from the above link:
"As I stated at the beginning of this article, SilverStone is well known for their quality power supplies. Their ST1000-P is no exception and performs better than any other PSU I've tested to date."