There's no need to bump your thread since people might just not have an answer. You have a lot of older hardware, and unless someone still plays on, or has kept very similar hardware around, then the answer is going to be very generic. Are you monitoring your hardware? Do you have any idea which component is the largest bottleneck at this time?

1GB on the video card is probably killing you, but the moment you upgrade that your CPU is most likely going to bottleneck, so from here, it looks like a losing battle unless you drop your resolution down to something small, yet tolerable. A 750Ti, or equivalent, is probably going to be a waste of money if you ever want to turn up any settings, but again, I'm not really sure—I don't normally recommend anything below the x60 version of nVidia's current-generation lineup, but the 960 doesn't really seem all that great for the price. You're going to have to go for the 970 in my opinion, but I have no idea if that will "fix" anything.

You don't mention what resolution you're playing at, but dropping that down will likely be the biggest improvement you can make at this current time until you can afford the new system.