Check out the buying forum. There is a lot of good info on the site if you do a little searching. I used this site to research buying my previous Kubota 11 years ago, and this year for buying my current New Holland.
Best thing to do is figure out what you want to do with the tractor, how much land to take care care of, and post that info in the buying forum. I would do some searching first though; there is a wealth of info here from the ten years this current forum has been in place.