I like the keys and quality of the A01 and if the 003 comes with the same switches then I'd like to see how it measures up. If either of them pops up on Yahoo! Auctions Japan before the JIS + Kana + Black switches Majestouch 2 is restocked at Diatech then I might grab it just because I've badly needed a new keyboard at work for quite some time.
Regarding the A01, the last time I felt similar keys, they were connected to an old Northgate 386 which came with a couple pounds of metal that just happened to also function as a keyboard. All other keyboards since that one have felt light in comparison. Unfortunately though, I was only 12 or so at the time and I couldn't quite justify keeping a keyboard I could no longer use to my parents.
Regarding the importing middle men though, I've just updated the Japan section of the WorldWide Shopping wiki entry with the importers that I have used/currently use.
The one that I've found to be the most convenient overall has been Goody-Japan. You pay for the item, sans shipping, with a deposit when you provide them the link to purchase the item (on their site). The next time you hear from them they invoice you the price of fees and international shipping and that's it. Provided it's not out of stock, they'll generally handle everything else without needing input from you. I prefer them over Noppin because Noppin requires too much input from you in order to get simple shopping orders done.
Edit: As far as the springs go, I don't really have many other options. I've already read about the effects you speak of (where even the orientation when attached can affect the ability of the spring to flex when compressing) so I figure 1 dollar for 10 tries is worth it considering importing another keyboard would be another 100~ dollars minimum. At the very least, it can't hurt.