If you want to enjoy GTA5, minimum with a 9800GT will be quite jittery. If you can afford a 750Ti, that will fair much better.
[video="https://www.youtube.com/watch?v=Nx95sTs5TpI"][/video]
I understand you're on a budget but just be mindful that when games talk minimum's, its really just to get the game running, but if you're happy enough with the likely performance above then fair enough. Rule of thumb though when being guided by recommendations is always treat recommended as minimum.