Wow, thats pretty low/bad. If thats your res, you'll be fine. Bottlenecking won't be a problem until you try to do something that a single thing in your computer will start holding other things back. In your case, your bottleneck is your monitor. It prevents your 5200+/9800GTX+ from performing to their full potential. I'd worry more about upgrading your monitor then your GPU.
Edited to include smiley.