Yeah, there’s no penalty as the upgrade from 6 to 7 has already taken place. You can always reupgrade to 7 with no penalty if the revert back to 6 does not work out for some reason. If I were in your situation, I’d go for broke as well.
For an off topic comment, I had some great times at Kalamazoo College visiting my buddies there. Ahh, the memories.