I would tend to stay away from sony. From all of friends that have bought sony in the past, they tend to fall apart after about a year or so. And good luck getting Sony Support to help you with it...they're about the least helpful people you can find.
You're going to be hard pressed to find a laptop with "good gaming" thats not too heavy. The lighter laptops need to have smaller batteries, because thats where most of the weight comes from. With a smaller battery, you need to start desiging components that have lower power draws than that top of the line graphics cards so the laptop will stay on for more than an hour 🙂 For under $2500, you can pick out pretty much anything reasonable.
Oh, and I would stay away from AMD based laptops. The only thing they're good for are leg warmers that last about an hour on batteries. 🙂 In the mobile market, Intel still rules.