Graphics Card fix..

Hi guys,

I have a old pc wid P4 2.8 , DDR1 512 , 915GAv motherboard....

Most of games are unplayable... i got frustated the otherday when i couldnt play AOE III over it..

so i need a basic entry level card ..coz i ll be buying a laptop in July 2009... so dnt want to spend much... m casual games... so 8400GS with 1 GB extra RAm...??? ll it fullfil the purpose??

plz tell me prices of both thanxx