Please, please, please - don't ATI cards!!!
I'm owner of the couple Acers:
Aspire 5100 +m200 ATI video (was used in pre-Crysis VU, since 2006) and Aspire 5542G + HD5650 1GB video card (in use now) - the same ass pain with hell heat and low graphic capacity as result!
Dunno, but think, that...