[blitzd]

You may want to look into Alienware - they tend to have a way better build quality than the Dell machines, and you can get better bang for your buck than typical 'workstation' builds for laptops. I'm not sure how well their smaller form factors are, as I've always gone big - but I've used various Dell and Lenovo 'workstation' laptops and I will be sticking with Alienware for the foreseeable future.

Edit: Also, my use case tends to be database development, data analysis, and virtualization.