Heh.. I saw 'budget' and I thought you were looking at like, under $40 or something. Since you're going with a standard ATX chassis (the most relevant part in this case), you have a lot of options. After that it's the fact that your video card wants two 8-pin connectors. Beyond that, anything goes.
PCPartPicker says your system uses an estimated 428 Watts. The video card itself is around 230 W, so if you plan on SLI'ing sometime you'll have to account for that as well, meaning 668 Watts. You should be looking at a PSU upwards of 750W or so in that case. For this you can get
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207033
XFX TS Series P1-750G-TS3X 750W, 80 PLUS Gold rated
Or for slightly more (130) you can get
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438017
EVGA SuperNOVA 750 G2 220-G2-0750-XR 750W, also 80 PLUS Gold rated, and with a ten-year warranty.
Personally I'd spend the extra ten bucks for the extra peace of mind. Also EVGA seems to have pretty good PSU's whereas I'm not sure on XFX (they're both known for video cards, but I hear more of EVGA for PSU's than I do XFX).