What is the best BTC exchange site to use in Japan

[CreditM8]

I've been searching on the net for a good exchange site to use as I slowly get my hands into bitcoins, while in Japan. (As the official Bitcoin site doesn't support Japan  )
There were various lists for quite a fair amount of exchange sites and if i can get a recommendation for one of the "best" or better exchange sites available to Japan, that'd be awesome.