I am comfortable with 16" x 20" - both in black and white and color. I can go to 20" x 24" in the JOBO CPP-2, but that would mean the use of a 3000 series tank, and I'd have to buy one of the wide angle enlarging lenses for my enlarger - and devising some sort of auxiliary easel for the enlarger.

I am nearly at the point where I will "standardize" on *one* frame size - I think it will be one of the "deep-dish" profiles - 2" or 3" thick, sloping to the glass - probably in a "gunmetal gray" finish. I'll print on 16" x 20" paper - using whatever area I think "works" at the time.