that's a tough call. the mobile graphics chips in laptops don't perform as well as graphics cards in desktops, some high end gaming laptops can get great performance.
definately stick with the intel cpu for your laptop, especially if you're going to play ah on it. get as much ram as you can, 4gb on a windows laptop is about like 2.5gb on a desktop with all the laptop specific drivers/utilities that can't/shouldn't be disabled.
there are 1 or 2 guys here that have high end asus laptops that are running ah very well.