In regards to the 4x5 enlarger possibility: you might want to do what I did and check local schools to see if they have old gear they are getting rid of in order to make room for d*****l (or in the case of my school, buying better enlargers). You might find a real gem that's about to go in the dumpster! You also might find contact printing equipment this way.
Funny, thing... I am the Arts Head of a large(ish) high school in LaSalle ON. For a variety of reasons the darkroom was recently closed, (It was idle for the last decade, long before I took the position) and I was able to bring home a few things that were in not too bad shape... but no 4x5.
(668... the neighbour of the beast... )
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...