GW, tractors don't depreciate much, if any. My first one was a Ford 8N that was made in about 1950. It's still ticking. I paid about $2K and still have it. Several neighbors have borrowed it when their tractors had problems. It's as handy as the pocket on a shirt.
About 6 or 7 years ago, I bought a new 4 WD JD with about 40 HP and a front end loader. I found that all new tractors are now rated at motor instead of PTO. It's been a dream and will outlive me. It cost about $25K, is fairly low mileage and is worth about what I paid for it. Power steering is great and the old Ford doesn't have it. I've used it, with a box blade, to clean out a couple of old silted in stock tanks.
If you get something with a front end loader make sure it is 4wd. Actually, I can't imagine not having a loader. I use it for everything.
If I had it to do over again I would probably, like ML says, look for a good used one. Big tractors, at farm auctions, are less popular than smaller utility ones in my area. Common sense evaluation methods just might mean getting a good tractor guy to help you shop.
BTW, 4 wheelers depreciate about 40% when they leave the sales floor.
It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.
Without a sense of urgency, Nothing ever gets done.
Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa