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I bought a Japanese Megadrive and never had any problems as all games would run on it and the power conversion was easy as pie. Alas, however, I also bought an American SNES (I was very impatient when I was younger I am slightly better now) and due to the signal conversion I had more problems. Also English games needed a converter and some would nut run even with that. After a couple of years the signal conversion box gave up the ghost and I had to go and buy a new SNES (UK version this time).
So, the moral of the story is, talk to someone in the know first. I am sure one of the import shops would know all the info you need.