Vista Compatable lappie

Hi folks,
I'm planning to go in for a lappy in a month and just started searching today.
Here's my requirements.

1. Vista Compatibility(Support for WDDM).
2. 512MB Ram(upgradeable)
3. Briteview / Ultrasharp or whatever they call the BETTER screens (size no
matter)
4. Budget Approx 50k.

Maybe the cheap lappies with a GFX card (bare minimum to support vista).


Pointers plz guys.........