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Why do you want a Japanese 360? Are there some good Jap 360 games not in the US?
Amen on that TG-16 with the cd..my old roommate had one, we used to be up till 3am rocking that thing out...I should have stolen it.
The Saturn RULES, they are pretty plentiful on ebay and you can get one of the import carts that adds the extra RAM for the later fighting games as well as adds the ability to play any region.
I made my own MAME cabinet, made a custom arcade stick out of PC USB controllers, had a couple thousand games. I eventually tossed the cabinet but backed up the games onto some hard drive somewhere.