What's a good HD graphics card upgrade for a Toshiba Satellite A215-S4807 laptop?

I'm taking a Modification and Level Design class this semester for my game programming degree and we're required to use the Unreal Development kit but my current graphics card has pixel shader 2.0. UDK doesn't support it any more so I'm trying to find a good graphics card upgrade for this... show more I'm taking a Modification and Level Design class this semester for my game programming degree and we're required to use the Unreal Development kit but my current graphics card has pixel shader 2.0. UDK doesn't support it any more so I'm trying to find a good graphics card upgrade for this laptop.

My laptop is running Windows 7. It comes with an ATI Radeon® X1200 graphics card standard.
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