New to this thread. I have a pair of 207's and want to upgrade to the 407 or 507. I am having a very hard time finding out where to buy these things. I tried via Amazon and after 30 days they said they had to cancel the order because they hadn't heard from the seller, who I presume is in Japan. The USA dealer seems to seller the 407 for $580 but there are none in stock. A dealer in Another dealer in the USA has the 507 in stock for $1095. A dealer in Germany lists the 407 but for about $980! Any suggestions good people?