Dell replaced my old pc need video card help.

So my PC died out on me an old 700 xps, so now dell is sending me this.

1 224-8766 Studio XPS 9100
1 313-7358 X-Fi Xtreme Audio PCIe
1 313-8757 Roxio 10.3, Easy CD & DVD
1 317-4595 Studio XPS 9100 Intel Core i7-920 processor(8MB L2 Cache, 2.66GHz)
1 317-4903 3GB DDR3 SDRAM at 1333MHz
1 318-0042 Blu-ray 6X BD-R, DVD+/-RW Drive and 16X DVD+/-RW w/double layer write capability
1 320-9227 NVIDIA GeForce G310 512MB DDR3
1 342-1490 500GB Serial ATA 2 Hard Drive 7200 RPM
1 464-7384 Exchange


I would like to upgrade the RAM and the video card.

What card would be my best bet for this pc.

200-250ish around 280 max