Stumpy, what processor has your computer got?

you want to be careful not to get a graphics card that is far to fast for your processor. the processor won’t be able to keep up with the graphics card, so the graphics cards full potential would be wasted.

dean, you can’t go wrong with the 6600gt. its a great card!

This is excellent advice. I get the impression Stumpy that you may fall into that trap if you are not careful. Limited upgrading is all right if you know ALL the issues involved.
I fell foul of that at one time – i had a damned good graphics card that was as useful as a chocolate teapot ‘cos the processor was way behind the times.I didn’t upgrade the processor because to do so meant changing the motherboard. In the end i had to bite the bullet
But that’s a fact of computer/flight sim life I’m afraid !

Unless you have a super duper case or PSU, it is as well sometimes to get a whole new computer.