As far as older tractors, I recommend a Ford 4000 (mid 1970's and up). The 4000 has wet brakes, power steering, it's around 50-55 hp and it is much more robust than an 8n or 9n. They are great tractors. If you want bigger, I think the 5000's are good too.
Whichever route you go, remember that at some point you will be headed downhill with a load and need to stop under control, so make sure the breaks are strong. Also, I personally would not get a tractor without power steering if I were going to have a front end loader on it. The weight on the front end can be pretty destructive on older steering mechanisms.
That's my opinion.
Gabel
