Harping on the issue...
get the cheaper chinese version and see how far you get with learning the style.
Get the Japanese version because maybe even if it's not useful to you, someone else in ONE can use it if it's completely authentic and it's not like the instrument looses value, though it might be very hard to sell, given the small market.
I'm clicking this, even though I know when you get obessed with something, it doesn't matter how many people tell you, "don't buy that," but really, don't buy yet another instrument. Go practice one you already own!
Japanese harp (not the best picture)