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Im coming into this a little late but... At work we run Mac minis and have a windows virtual machine running with Microstation CAD software, its fast and has no issues with running photoshop on the Mac at the same time. The VM also makes sharing files a non-problem, as anything saved in either OS is instantly accessible in the other.
Personally I dont get on with windows so I much prefer to do everything in Mac except the CAD which is windows only. That way I just have it set as full screen on a separate desktop for flicking into and out of. Its an efficient way to work.
If you run a VM from an SSD, you shouldn't suffer performance wise. It's pretty slick these days.