I'm sure you can get medium-high grapic settings on Bf2, medium on d3, high graphics settings on HL2 (Source engine is ATI optimized! we get insane framerates! w00t!)
So yes, the x600 will give you some pretty purdy graphics man, don't you worry about that. It'll give your eyes something good to look at. The x600 is pretty much the PCI-E of the 9600 series. My 9600 pro gives me some good graphics. So yeah, if you can, actually try to find a laptop with a mobility radeon 9800 pro. You'll get even better graphics, might cost you a few extra bucks, but definately worth it. What I found interesting is how the x800 pro really beats out a 9800 pro, I think ATI really put their focus into the x800 series when they were working on PCI-E, and the rest were just PCI-E conversions of their agp lineup..
Now here's a funny benchmark on HL2 (remember, ati optimized, so don't rate nivida on this benchmark ok?):
haha, note the bottom intel "extreme" graphics. both at a sizzling 6.2F/S.. rofl, it was sucking soo bad on 1024x768 rez that on 1280x1024 the framerate diddn't drop cause it already hit the bottom! lol, gj there intel, way to.. well.. suck.
now this one actually shocked me:
intel actually played fine!? but remember, it had the advantage of not rendering any advanced pixel shader stuff and no T&L either. so it just did texture n' geometry and basic particle effects. Intel really needs to learn how to make better intergrated graphics. I mean, at least get support for basic T&L. Many games require at least T&L to run, so Intel should at least get their specs up to absolute minimum to run most games.
Oh silly me, forgot to tell you guys with ATI cards how to gain a lot of Framerate back by simply modding 3 lines of code.
That helped me get some framerate back. They say it's not needed on newer drivers.. but I dunno, I still use it.