What graphics card could I use on my computer

forgot to list the power supply...............

you need to buy ram. 2gigs is strangling your system. so I added ram and compromised on the card a bit.

at that res you should get a card with 2gigs of vram ( 1 included )

ram
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231207
card-1gig
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121727
card 1gig
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130914
card-2gig
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130909




 
Power supply is 600 Watt