With that PSU you can run pretty much any dual cards setup...
As for brands, I guess Evga for Nvidia cards, or Sapphire for Radeon, but it doesn't matter much, really. I would avoid Power Color, and to a certain extent, MSI, but any other I think have their benefits. I usually buy Gigabyte, they have a good offer and decent price, and I pulled out a couple of their old cards (the newest was five years old) from dead systems that were never maintained, that I've used back in some stations at work, they run perfectly well and even found updated drivers for Win 7 and Win 8 on their website. But I guess the brand you should choose depends mostly of what you intend to do : try to overclock the hell out of it? I guess some brands would do better at that, I wouldn't know, me I just plug it in and keep the drivers updated - not a tough job, the software does that for you.