Thanks for the replies.
You definitely need a new GPU. Get the best one you can afford. Dont worry about the CPU not being able to keep up because while it will give you less performance than say a 2500K, itll still give you better performance than what youve got now. A GTX680 with your current processor will still far outperform a GTX560 with your C2Q. So get the best GPU you can right now and then when you finally upgrade your motherboard and CPU, youll be set for video card.
So I can go as far as I can afford with the gpu before my cpu becomes a bottleneck?
@MegaMan1, @recon-uk my idea of dual vs quad core is that a programme that can use all quad cores at 2.5ghz will perform as if it is using a processor at 9-10ghz while a dual core i3 with its two physical cores at 3.1ghz will be like 6.2ghz to programmes that can utilize its two cores. So despite the technical improvements in i3 a core2quad would be much faster in the newer games that can use all the four cores.
Is this how it really works?