If your budget is in the 200 dollar range,you have two choices,the GTX 760 or the R9 280X. Of the two,the R9 suggested by iron8orn is much better and comes quite close in performance to the GTX 770 suggested by TheMineBot for a substantially lower price. And yes,your PSU will just about handle that card,but I'd still recommend upgrading on that front as well.