The XFX XXX 650W PSU has 52amps +12v power. The TRX750M has 56amps +12v power.
I think the XFX 650W is the better option. I haven't yet seen any reviews of the TRX750M that have tested it at full power.
Corsair 650TX 52amps +12v and has a really good price. $95 plus $10 add'l off and a $20 rebate. It only has 2x PCI-e power adapters. But I'd put up with a couple molex to PCI-e adpaters for that price.