I wouldn't get that SSD if i were you. Since is a laptop, it lack the expansion to add addition hard drive. 250GB is not a lot. And most people who had gotten a SSD mainly use to store their OS partition in there. Very rarely you see people uses SSD for file storage.
The video card is alright. I would say pretty much is a mid end card. It'll run most game, but it wouldn't be running it on max setting. As for graphic work. You'll be fine with that card.
Dell xps is knowing for their heating issue. I have a xps 1330 and that little guy run pretty damn hot. I had to go out and get my self a laptop cooler just so it wouldn't burn my lap. And after taking that thing a part i realize dell had been using a very very cheap thermal compound on the GPU and CPU. So i'm not too sure how your XPS 16' will be like.
Mac pro is expensive for the parts you will be getting. You can get a spec equal or even better than a mac pro but pay less. For mac you pay more on the build quality rather then the spec itself.
Hope you enjoy your new toy. I was planning to get this laptop too and give my xps 13 to my GF. But she said no and wanted me to save up.
Oh btw looking at the spec i'm guessing you kinda pay 1600ish for it? If you did you should have gotten this. A 1920X1080 display is nice on a laptop =)
http://ncix.com/products/?sku=50903&...nufacture=ASUS