That's rough. What is the rating on your +12v rail - It's also on the sticker; will look something like +12v @ XXa.
Your +12v rail isn't likely to be able to support any card that requires a 6 pin connection (you'd probably need an adapter for one anyway). The PSU *may* support an HD 7750. That's the fastest card that's powered through the pci-e bus (~$110).
Doesn't really matter, most manufacturers are fairly reputable. Off the top of my head, Asus and XFX are a couple of the more reputable companies in the video card market. Gigabyte, sapphie, HIS, and MSI are all decent, too.