Curt,
I've been drawn to the 14x17 format for a while, but the clincher was the availability of affordable 14x17 Fidelity holders. I have neither the skill, the inclination, nor the time to attempt making my own holders. Based on past experience, in non-standard formats (4x10, 6½x8½, 7x17 and now 14x17), I've learned to ALWAYS get some viable holders FIRST and then start worrying about trivial things like a camera. I got burned once in the past by purchasing the camera first (a 4x10 Wisner) and then being unable to locate usable holders that fit it. For about the cost of 1.5 cutom made 14x17 wooden holders, I now have 7 of the 14x17 Fidelity holders. The only real complaint I have (or will have when lugging them around in the field) is the weight. I think wooden holders would weigh about half as much (but cost 4 - 5x as much).
16x20 would be great, but I think I'll stop at 14x17 (of course, a year ago I "stopped" at 7x17).
Kerry