If this has a 64 bit OS I might consider double the RAM but the 450 was no slouch. But next up would be the video card. I like the list at the link to follow.
Bob
-> http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html
Hi everyone. I am planing to do an upgrade on my pc in the future so i have to make my plans. I am a pc gamer so the new consoles make me think that it's time. I don't have a lot of money so i gave everything on the new pc from the start. Here is what i have now.
Processor: Intel Core2 Quad CPU Q9550 2.83 GHz
Graphics card: NVIDIA Geforce GTS 450
RAM: 4GB
Ask for more info, just tell me how to find it, I'm not a hardware expert...
My goal is gaming with little money. Do i need to change one? Both? What first? Try to post links on your model suggestions.
Thanks for helping !!!!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic