between the 4850 and 9800GT, my vote goes to ATI 4850. or if you can add a little more, get the 4870. 
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E7300 | Gigabyte Volar | Asus P5QL PRO | 4 x 1GB Team Extreem Dark DDR2 800 | Palit 9600GT Sonic 1GB DDR3 | HEC Raptor 500W | 120GB, 320GB, 200GB SATA HDD | 20x LiteOn DVDWR | Viewsonic 19" Wide
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