But you can bring the 360 back. BUY ONE
Considering how bad the 360 has been selling in Japan, I'm pretty sure the available stock is of the old shitty kind that always breaks down. What happens if I take it back to the US and it dies there? How would I get it fixed? Better to just wait and pick one up when I go back home.
And nintenho, the voltage difference between Japan and the US is negligible - Japanese PS2s, Dreamcasts, Saturns, SFCs, etc. work in the US, and the reverse is true as well.