Xigmatek use HEC to manufacturer their PSU's... at least most of them. And they are... garbage.. >.>
Corsair, Seasonic, Enermax, XFX, Sapphire, PC power and cooling , Zippy are all PSU manufacturers who go above and beyond in quality, performance, and warranty.
I'd go with a TX650 from corsair, or if you plan on crossfiring in the future a TX or HX 850. Depending on your budget. But also make sure the card they sent you isn't bad as well.
I5 3570K@4~5.0ghz: Gigabyte GA-Z77X-UD3H:Corsair Hydro H70w/Delta 240CFM Fan: 16GB Corsair Vengeance DDR-3 1600: 2 XFX Radeon 7950 @ 1150/1575 : Corsair AX 860 PSU: x2 WD Black 1TB HDD's: 90GB OCZ Agility 3:CL X-FI:Corsair 500R Arctic White Edition:3 22inch Asus monitors Eyefinity @ 5294x 1050(bezel comp) : Alienware Tact-X Keyboard: Naga Razer gaming mouse:Corsair Vengance 1500 Headset .