Make sure you guys are comparing the right tools, you can not compare Mac Pro to a shitty machine like entry level (insert brand here) ___________, if you are gonna compare, see Business Class Dell Precision Laptops vs. Macs. So the hardware issue is non existent. I’ve used both Mac’s and PC’s, both can do exactly the same thing. Now if you want to be with the cool kids go ahead buy expensive tools, from business perspective this makes 0 sense.
If you don’t already have the Adobe software you could get a MacBook and buy software like Sketch and PixelMator which will do pretty much what you need for web work for a fraction of the cost. The money you’ll save not buying CS6 would cover the difference in price between a Mac + PC laptop.
Or have you considered a second-hand MacBook? I have a 2010, 15″ MacBook Pro ( i5 processor ) running Mountain Lion without any problems and apparently if you stick an SSD drive in there it’ll be almost as good as new speed wise…
I love my xps 12 cause its shiny, its new, I can touch it, and when I flip it around in public everyone goes “ooooooooooohhh, ahhhhhhhhhh”. Its great for presenting to clients too.
My advice on buying a new computer, go to best buy or some other store, play with a few laptops, buy the one you feel most comfortable with. I cant stress enough actually typing and viewing the screen on a laptop before you buy it.