I'm strongly thinking about importing (let's see... next week... versus four months wait... hm...), my only worry is the Quest mode, the one where you travel the map and fight battles with different requirements like "Must throw opponent for a Ring Out," "Sinking in Quicksand," and the like. If gives you the instructions beforehand, but I've got next to no skill at understanding written Japanese. I could work out some of them, but others at best I'd be staring at a FAQ for all of the time, and that'd be a bit of a bummer. Still, maybe someone will make a handy print-out map image for reference...
Isn't it fun when you talk yourself into a purchase? ;P