oh right sorry i thought you meant 400 for the gpu wasnt sure though
anyways karis post is old stats i think because i just found this: http://www.tomshardware.com/reviews/geforce-gtx-660-ti-benchmark-review,3279-9.html
and that shows that what kari said the titan gets the 7870 gets around the same...
Btw if you choose to get the 7900 series card then get the 7970 because as the chart shows the 7950 is pretty much the same as the 7870 by 1 or 2 fps
To be honest go with a 7970 will give you over 100 fps or there abouts and oc's well so will last longer, its a beast card try get a club 3d one (not very well known, but i have a club3d 7870 and oc's awesome and decent cooling for 1 fan and they all have there mainstream technology on) if you can find one of course becasue in the Uk they arent very popular atm your probs best off looking on ebay for one of them maybe in the us it will be easier i dunno or if you cant get a twin frozr card by msi and another good oc'er is the gigabyte 7970 all insane cards trust me choose 1 buy it and dont look back