What performance would i get?

[McNuggets89]

So iv downloaded the EMU and am wondering if its worth finding my gamecube discs that i own to play them or should i invest in better hardware before i do that.
The games im looking to be able to run are the legend of zelda the wind waker, sonic adventure and the resident evil's. (0,1,2,3 code veronica X)
i would want these to run at a playable FPS graphic details im really not bothered about

if i needed to upgrade my video card what would be a decent not too expensive card to go with, i dont really have hundreds to spend just on a video card.

windows vista x86 (i know i should upgrade to 7 i will someday)
intel core 2 duo E8400 3ghz
ATI radeon 5450 1gb ddr3 (overclocked: GPU 700mhz memory 750hmz)
2gb DDR2 ram (4gb in 2-3 days when i get it in the mail)