The single most important and best recommendation I can give is this:
Buy the best graphics card you can afford (try to push your budget) with as much GPU memory as possible… The very minimum would be 4GB of video memory, but I recommend 8GB… and if you plan on using multiple monitors, then double the memory amount.
I realize that your K2200 already has 4GB, but even it is now somewhat outdated and there are lots of better choices out there now. It won’t matter how fast your CPUs are if your display is the bottleneck and you’re doing any frame updates in your calculations…but I guess it also depends on what kind of feedback you want/expect during whatever it is you’re doing.
Also, if you plan on doing any kind of renderings using the new Raytraced mode, then NVidia and CUDA core counts should definitely be on your list.
-J
P.S. I’d also start preparing to ditch Windows 7.