[geek_rohit]

All these brands are good. But I would suggest please don't go for the ASUS brand as these cards aren't such a great performer they used to be moreoever they are costly as compared to other brands. Instead for nVidia choose Gainward and XFX, for ATi choose Powercolor and Gigabyte, whichever suits you in terms of price, software. bundles, etc.
EDITED:
But don't go for the LE version. For Radeon go for the 9600.