i'm building a new computer specifically for use of 3D graphics software such as Maya, and other media editing/creating software as well as some gaming and i need to know what graphics card would be the best option for my new pc. Has to be very good/quick when rendering in Maya. i'm down to 2 graphics cards, but dont really know which would be ideal as i dont know too much about graphics cards.

128Mb ATI FireGL V5100 PCI-E (x16) GDDR, Dual DVI-I, OEM

or.

Leadtek GeForce 7900 GT 256MB GDDR3 TV-Out/Dual DVI (PCI-Express)

other cards that are better in the same price range as above please let me know..

pc spec - amd x2 4600 (Socket 939), 2GB Ram, ASUS motherboard, 250GB Harddrve...

Any help would be appreciated, thanks