"I'm in the market for a new saddle for my new summer bike - thanks for any advice anyone can give. I'm 6' 0", 250 lbs, if that matters at all."
It's your riding position that matters. The B17 and the 17n are fine for more upright riding, bars even with the saddle or a tad higher. I can't imagine using anything bigger, the B17 is fairly massive, and I am large framed 6 ft guy. The 17 & 17n are the only saddles I can ride comfortably in pants, no liner, for anything under 20 miles. Great commute or tour saddle. The Team Pro is more of a personal preference and the setback is very limited, more so than the B17. The B17s are becoming ubiquitous, they're everywhere..including most decent LBS. Just realize, if you are a high cadence, fast bike, rotated rider, ... they're kinda useless.