VIDEO CARD UPDATE PLEASE TELL?

I want to update my video card to the onw which can very well support visual features of Windows 7 and Zune and all that....can just anyone estimate how much it may cost???|||if you got fairly newer pc that has pci-e then get GIGABYTE GV-N56GOC-1GI GeForce GTX 560 (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card http://www.newegg.com/Product/Product.as…|||from 50$ to over 700$