A good card is the geforce 6800 ultra, this one has the dvi out that you can use on that new tv of yours. The second one in the link is a faster card than the 6800. Only would need this if you want top performance for games. Third link is top of the range.

http://www.scan.co.uk/Products/Produ...oductID=295853

http://www.scan.co.uk/Products/Produ...oductID=273363

http://www.scan.co.uk/Products/Produ...oductID=322286