Both gentlemen are the best of the best. You may save a little elsewhere, but in my opinion, the risk is not worth it. Both ship promptly; it's not unheard of for someone in the US to order on Monday and be wearing the watch by Friday. And they include shipping in their prices.
There are no options on the SBBN007 - although I believe both can equip the watch with that unflattering "Italian" aftermarket bracelet that a lot of folk seem to like.
http://www.higuchi-inc.com/prospex.html
http://kseiya.zoovy.com/category/2_for_divers/
The 300M tuna is an incredible watch. It's been my daily beater for two years, and is the best value diver I have ever owned. I got it from Katsu Higuchi, who was a joy to work with. However, if you do go to Higuchi, use the contact form on his site to email him. He runs a watch shop in addition to his web business, and direct email can delay his response.
