So the base RMBP (which I ordered) comes with the Intel Core i7 3610QM (base, 2.3), and the upgrade options are the 3720QM (mid, 2.6) & 3820QM (high, 2.7). I've looked on Intel's website and I see that the 3610QM is VT-x enabled (for Intel virtualization technology) and the other two options have VT-d support. What exactly does this mean? I plan on using Parallels for virtualizing different OS's on the machine (which is why I opted for 16gb ram), but I don't know if I should have went with the 2.6 or 2.7 CPU. Price was kinda a factor to me, which is why I choose ram over ssd/CPU. Did I make the right choice?