Also, I've had Palm Press in Concord, MA make large gelatin silver exhibition prints. I can't really print bigger than 16x20 in my darkroom, and they have made some beautiful 20x24's for me. http://palmpress.com/
Do they work under your direction, or with printing notes you have made? I have no problem with labs doing proofs for me, but I might be a little more reserved at giving them creative control over my final prints.
Tom, on Point Pelee, Canada
Ansel Adams had the Zone System... I'm working on the points system. First I points it here, and then I points it there...