Well if you would like a card that is actually a good deal for the money this is what I would recommend;http://www.dabs.com/products/gigabyte-geforce-gtx-560-ti-448-cores-732mhz-1280mb-pci-express-hdmi-7V8G.html
Its performance is right in line with the old GTX 480 but it is a newer card with a significantly improved power/heat profile. It also overclocks quite well. Above that card the price/performance really goes down a large amount. For example the GTX 580 and the HD7950 have a similar performance and price. They are both 15-20% faster than the card linked above at 1080p but they cost about 60% more.