I just bought a B68 from Wallbike and was starting to panic that I'd missed an opportunity....whew....only the "S" model.
Hate to whisper bad omens, but I've ridden both an SMP and a Brooks and dialing in the Brooks is a lot fussier than dialing in the SMP. Get the set back first and then keep tweaking the angle. When you get it dialed right, it will be a great saddle.
Oh, and Ben's has been in the bike business as long as Milwaukee's been a city....ok, maybe not that long, but a long time. They're known for fixed gear and they carry their own line of bikes produced by Waterford. That said, I also am not affiliated nor will I swear by them, but I'd trust them. Many of the people I ride with do all their business with Ben's. I've got a good LBS closer than them so I've never been.