I won't be in position to build a gaming PC for a while, so I'm trying to make the best with what I have. I still play games on it, and was thinking of upgrading my video card tomorrow since I'm getting a new PSU. I currently have a 8600 GT, and had my eyes on a HD 4850. Would that be too much for my old 3200+ AMD CPU, assuming that I will have bottleneck issues? If so, what card would be best for my setup...or would I even see an improvement with any type of video card upgrade at this point?
Sorry to say it, but your current 8600GT is overkill. I had the same components with a 7800GS in my old rig and it never performed right. It wasn't until I upgraded to a dual core processor that it performed as it should. Looking at Tom's Graphics Hierarchy Chart, your 8600GT is on par with my old 7800GS. Keep what you have and save until you can rebuild.