oooh thats a nice card. your cpu will definetely be bottlenecking it though. youll get far from as much performance out of it as you otherwise would with a heavier cpu. might also want to consider ram upgrading then. (4gb)
if you dont want to spend a lot of money its rather pointless to get this card, its just too powerful. not to mention youv'e been playing with a rather old card so this is a very big step up.
id sooner go for a 5650 or 5750, 5770 for your config, all of which will perform very well.