iam2thecrowe :
people who buy macs dont want a perfromance PC, they want a pretty PC that they falsely believe is somehow better than any other computer. Then they get it home and realise it has limited use and install windows.
Um, that would be BS and it sounds ignorant. The kids here never fail to make me chuckle.
However, there's no real benefit to getting a Mac vs. a solidly built Windows machine. As long as you can got a solid chassis (magnesium, aluminum, etc.), a good screen, a nice keyboard with little or no flex, and the class of CPU and GPU you want you can probably find a PC laptop cheaper. There are no mobile specific hexacore CPUs but do you really need one? With the 2920XM and 2960XM "Extreme" mobile CPU you've got more power than you probably need.
I currently have the most powerful Mac laptop they make and while I'm very happy with it its extremely expensive. If you're going to spend that kind of money and you don't just have a preference for OS X or Apple hardware you can speck something like a Sager for the same or less money and get a faster CPU, GPU, and HDD or SSD. Service and support may not be as easy as popping into an Apple store but perhaps onsite service options can be bought. If you're really serious and don't need something too portable look at the Dell Precision M6600 mobile workstation.
Now, I'll admit my laptop's i7 2820QM is quite quick. Running multiple VMs simultaneously (which I do every day with Parallels) can benefit from all the cores but hyperthreading on these CPUs really does give you a lot of power. If you're serious about running these VMs you'll want gobs of RAM. 8GB at least and 16GB would be nice. For best performance you'll want multiple fast storage. I use a Vertex 3 SSD and a 7200RPM WD Black in my MacBook Pro so I can run multiple VMs simultaneously.
My Mac Pro has a hexacore while it is more powerful than my MacBook Pro for running VMs its not night and day, really, which is quite nice.
...and folks, there's a lot of benefit to running VMs as opposed to physical machines for a lot of things.
Serious work, on a Mac, and it has nothing to do with the arts.