The laptop actually comes with an mx518 mouse already, so id be set for gaming on the go.
And i love the dual hdd bays. I can throw my music collection and a few movies on the secondary, and keep my programs and os installs on the first. I could try to sell my current laptop for about $300 on ebay to bring down cost a bit.
And in terms of gaming, apparently this lappy gets a good 7000 in 3dmark06 at 1280x1024...very impressive for a midrange graphics solution.