I',m lucky cause Germany has the same region code as Japan, so there's no problem to play japanese DVDs on a player here.^^
But you're right, it doesn't really matter which version, the content is the same.
Arashi's best is sure worth to get, seriously, it will be one of the top sellers this year.
All 6 editions from Real Face?
You're a big Kat-tun fan, I know how you feel.