Keep in mind that you are violating Apple's EULA - Snow Leopard can't host Mountain Lion VM's.
You're probably done with Mac's then, a new 17" is unlikely to ever happen (I know a lot of folks who are annoyed at that too).
I guess I don't know what parts you're talking about - there's not many major UI changes that can't be reverted, but to each their own :-)
Good luck!