If you value portability highly I'd consider an Alienware 13, forget about the whole "futureproof" thing though
You need a bigger laptop form factor for the goods. These threads could be a good start:
http://www.topg4u.com/best-gaming-laptops-under-1500/
http://www.tomsguide.com/answers/id-...ptop-1500.html
The same brands mentioned in there have some nice desktop offerings