Received my SBBN017 on Saturday. Seller was "ibuyjp" on the 'bay and I can confirm a good buying experience. Price was reasonable - $950 shipped and insured, although it looks like they're now selling for a little less. It took about 5 days to arrive at my house from Japan. I haven't received any bills for the import yet, so fingers crossed. The watch is everything I'd hoped it would be. A small note... I usually hate Seiko rubber dive straps (the Z22 series, at least), but the B22 series strap on the Tuna is awesome. The rubber is way more pliable and comfortable, and the signed metal keeper is a nice touch, too. I temporarily put my watch on a Strapcode mesh that had been sitting around. I really like the look, but I have a bjstrap on order which should be here in the next couple of weeks.
For the longest time, I couldn't justify spending a grand on any watch... it just felt wasteful, as I kept coming up with a list of "better" ways to use the money. After buying a slew of cheaper watches to fill the void, I realized I'd never get over the Tuna I desired so much and finally pulled the trigger. I'm 100% satisfied and hope that this will be my last watch purchase for a while. Time to repaint the kitchen, upgrade some windows around the house, etc.
(There's also a pic in my signature.)