Fully recommend the XPS, i've never used a faster machine than mine. Macbooks are over rated pieces of crap, slow and have the poorest compatibility i have ever encountered. A rip off that you will spend most of your time trying to convince yourself is good.

As I've said countless times in many other threads, i sent my mac back after 4 days of having because it was just that bad. They are no better for designing at all, in fact i thought worse. Only get it if you are completely obsessed with your image of using a computer in public and want to look cool...because thats just about all they do well.