So how much do you have right now??? is a new card might not be the best use of your cash? Would some more RAM or faster hard drive give you a better improvement?

Don't forget the sound card... If you are relying on the "on-board" sound you could be affecting the overall performance of your system. Also have a look at the type of USB devises you are using. Complex USB devices use CPU cycles to run.

Getting the most out our hardware on a budget is a fine balancing act