I shoot 35, 6x6, and 4x5 and for years, 11x14 (proportions adjusted to use the 14 as the longest dimension) was my standard "finished print" size (1/2" border all sides, a little more at the top for linen tape). I feel that it's large enough to experience certain aspects of some images, unlike smaller prints.
However, in the last couple of years, I had a couple of shows in larger spaces, and when walking into one a couple of years ago, I realized that I needed to print 16x20 because of the size of the space. It's a lot more work (not a large darkroom, but big enough), and obviously more expensive, but I really like the images at that scale.
I may change my mind later, but for now, I'm thinking about buying 8x10 for contacting, and bringing up the "recipe" (exposure, filter combinations, burning, dodging, etc) for each image (toning too, sometimes). I also scan 8x10 prints for marketing, etc. and for my data base. Then one box of 16x20 to use at any size I want for larger prints. This is all Forte fiber VC.
Oh, yeah, and I have one of those great Kodak easles The Flying Camera mentioned. I'ts painted gray, about zone VI, right?