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there are very few linux games that require anything more powerful than the ATi 9000.
The biggest linux game out there right now, Doom3, will be almost unplayable on that card. But a 9600 with 128 meg of VRAM will play Doom3 at a reasonable clip, and that's not top of the line anymore in the mobile video market.
If they are just targetting business, I would go ahead and cut the price more by just putting in one of those shared-memory Intel cards.