Steer well clear of Intel GMA graphics, their just awful. The New HD2000 and HD3000 series thats on the I-series M processors is better though.
ATI.... drivers nuff said.
Only option is nVidia. I'll ask the question thats on everyones lips. What are you going to use it for?
This site should give you an idea of what the different mobile GFX chips are like.
http://www.notebookcheck.net/Computer-Games-on-Laptop-Graphic-Cards.13849.0.html Agree, mine laptop keeps messing up, you know when it is messed up when the Aero feature goes missing in the properties section