Having boxed more on notebooks than my ew desktop, I think those specs will be fine for boxing.

As mentioned above, the 15" will be limiting, I find my 17" lappie a bit of a pain now after the desktop, but you may get used to it I guess.

With regards to the heating issue, I am not sure if the XPS 16 suffers from a widespread heating problem or if it is just an isolated case. It is not uncommon to see isolated examples of overheating with laptops which may be resolved by a simple return for overheating issues and a replacement system that functions acceptably.

Keep in mind however that any laptop that you wish to play any recent game or box WoW on will produce some heat, so don't judge them too harshly for this. If you run a temp monitor, your CPU and GPU will get a lot hotter than they will in a desktop setup but will generally still be within design limits for mobile components. My solution has been to grab a $50 laptop cooler which goes between the computer and my lap.

I have recently been using an Asus N61JX with an ATI 5730 but otherwise similar specs to above. It runs nice and quietly, graphics are fine, screen is just big enough and heat is manageable.

From memory, Dell used to do a 21 day no questions asked return policy anyway. Stick with the order, try it out with your boxing and if it sucks, send it back and order something else.

Cheers