Sorry dude - not I....
I only have the one laptop and I only use it for demos at clients... it's running Windows 7 which is a massive improvement over any other windows OS but other than that it's just a pile of crap... and since it's just a laptop it's not worthy of an upgrade nor replacement - until it dies at least....
So basically put - I know piss all about laptops.
However...
Why not just upgrade your current one?
It would be a lot cheaper....
Hey - why the 4GB of ram?
Are you into movie production or 3D animation or something?