I've been pretty happy with my old Omega DII. It covers 35mm to 4x5. I watched them for a while on the auction site and they tend to go pretty cheaply. Tons of used accessories available as well.
For reasons I can't remember right now I think the slightly newer D2 is the better unit.
Speaking of small darkroom spaces. The darkroom I'm vacating was so small I had to use my enlarger sideways.. no lie.
Best of luck setting up your space.