I have over 80 machines, most working. My favorites are Kenmores from the 1960s and '70s. I have 3 industrials (Juki, Adler, Union Special) and a growing collection of overlocking machines. Pfaffs are also a favorite, especially the 30, 138, and 145. And Adlers (87, 187, 98, 167). Oh, and Ankers, Meisters, Gritzners, Neumanns, and pretty much any German machine prior to the 1960s. And a working studio wouldn't be complete w/out a Singer 201.
One of these days I'll learn to sew -- work and casual clothing, primarily. And I'm looking into taking an upholstery class for which I'll purchase an Adler heavy-duty straight industrial, probably a walking foot or some other type of compound feed.