Interior doors we went with pre-hung 1 3/4″ solid core birch slabs, all 7′ high, mostly 32″ wide, 36″ for utility room and main passage from the laundry/mud room. Hinges were normal butt hinges in satin nickel, looks like they were Hager hinges. Prepped for radiused hinges and a single standard bore. Doors were a little over $200 per copy (strangely the one 20″ door for a linen closet was the most expensive at $263).
I didn’t realize the hinges would squeak and spew out black graphite, I would have happily sprung for ball bearing hinges to avoid both of these problems. Former problem is fairly easily addressed by banging the pins out, cleaning things up as best you can, applying white lithium grease to the pins, and banging them back in. Latter is only bad if the hinge is not tight to the jamb, which ours mostly are not. I don’t know how long it will take the graphite to dissipate, and I am not sure how easy or hard it will be to try to clean things up (seems people suggest using trisodium phosphate or Krud Kutter).
