ZBrushCentral

$1500 to spend on tablet/laptop/desktop.. recommendations

Hi,
I have about $1500 to spend on a new computer because my old laptop with 2.5ghz core 2 duo, 8GB ram etc isn’t cutting it for zbrush work.

I’d prefer buying a drawing tablet like the Microsoft Surface Pro 3 but I hear there are issues with the rippling screen, ntrig drawing pen etc.

Is the Surface pro 2 adequate for most Zbrush work?

Any other options or recommendations? Or would you rather buy a laptop (recommendations please)?