If not an 8N or 9N, what would be a good recommendation for the work I might be doing under my budget of say $6k (listed in first post)?
Just to give an example, we still have a later example of the John Deere 2 cylinders. Ours is a 1960 JD530 2 cylinder that has power steering, clutchable PTO, power adjustable wheel width, quick detatchable loader, maybe the best 3pt hitch ever made, suspended seat with damping....the list goes on and on. It even has a mount for an umbrella - which JD still sells!
At 12K hrs it runs like a top. Parts are easy to find and reasonably priced. Makes max HP at 1175 RPM.
Downside is the same as any old tractor - they are a long throw manual shift, with a large turning radius.
Alternatively, there were many US-made awesome tractors built in the 1960s and 1970s. I would say that many of them have the same good points I have just listed. Look to the 40/50 hp Massey Ferguson and any of the John Deeres and Fords. Case made some nice ones, too. Do not be afraid of gassers; those old industrial gas engines are excellent.
I think you are better with the 1960 through 1980 models instead of the 1940 through 1955 model tractors like the 8n and NAA era Fords.
That way (1960 thru 1980) you will get a tractor with features that work well today. Much better transmissions, more modern hydraulics, and power steering - which is necessary for loader work.
Your budget of 6K should be able to find you an excellent tractor from that era. For that price it should be a cream puff, with attachments, and ready to work.
rScotty