My BF has the Globe and loved it (he has since switched to a fixed gear for his commutes). If you have to lug stuff around and aren't interested in it being attached to your body, the Globe is a great set-up for a rear rack.
I switched from a traditional road bike with drops to one with arc bars. I like that it retains the lightness of a road bike, but isn't quite as aggressive. I can still go super fast, but I have slightly better traffic awareness since I'm more vertical.
If you want to go fast and are used to a road bike, a mtb might not make you happy. I feel like a sluuuuug when I ride one on the streets, and you might benefit from thinner wheels. Try looking at some different bar combos on your road frame, And maybe some cyclocross tires if you want the knobbies.