**Help Upgrading PC** Computer Junkies needed

[Bigjmaster18]

motherboard: GIGABYTE GA-EP35-DS3L
http://www.newegg.com/Product/Produc...82E16813128337
cpu: Intel Core 2 Duo E7200
http://www.newegg.com/Product/Produc...82E16819115052
GPU: 9600gt
http://www.ncixus.com/products/28597...imedia Inc./
RAM: G.Skill 4gb DDR2 1000
http://www.newegg.com/Product/Produc...82E16820231145
HD: WD 640GB
http://www.newegg.com/Product/Produc...82E16822136218

so far thats my list on upgrades(taken from another thread)

anyone care to make any suggestions or cheaper parts that perform betteR?

Thanks in advance