I only have two right now- a normal and a pied. My normal is very large-- over 4' at this point and chunky. He is in a 30 gallon which has a 12" x 36" footprint, so I want to go with the CB-70 to give more space for him, instead of less (with the sweaterbox). My pied is the one who has been having shed issues. If I got the three slot rack, I'm sure I wouldn't mind having another snake to fill it-- probably either an albino BP or maybe another pied. Pied are my favorite morph. So variable. Would I keep more eventually? Possibly.
My ambient heat in the basement is low-mid 70's. I would probably get belly heat and run it with a Ranco thermostate. Had plastic cages from AP once and didn't care for them. They were very bulky, impossible to light, so very dark inside. Not a lot of useful space.