There is nothing cheap on your list, and if you buy any of those cars at the low end the cost of missing parts and body patching will eat you alive...
I speak as one who got into '32's at each 14 or so in the early '60's...Since being unable to afford much then, I have spent my life watching prices escalate steadily at a rate greater than my rising income!
I now have my dream '32 roadster, but mostly through dumb luck.
My thoughts here on how to get into a roadster, not cheaply but as cheaply as possible:
Start with an original '32 chassis...not cheap, but relatively under valued.
From there, Brookville roadster body. Again not cheap, but a pretty damn good and WAAAY cheaper than an original, way more satisfying than fiberglass. And you know what the cost will be.
This could be assembled one lump at a time, and repro parts eventually swapped out for original if your funding and/or luck increase radically.
'33-4 original expensive, repro steel substantially more expensive than same for '32.
I think '35-6 only available in glass, and of course originals also expensive.
In addition, as roadster sales became less important. '33-6 original roadster bodies regressed to heavy use of structural wood, making everything harder to deal with than '32.