FWIW:

My 26 yr old Ford/NH 7610 I bought in 1999 with 100 hrs of county mowing on it is the easiest starting, most simple, most reliable piece of powered equipment I've ever owned. A couple generations up from a 4020.

A track loader is about the most useful piece of equipment I've ever owned. Problem around here is often mud. Wheeled skid steers are useless in many field conditions. A 2700 or 3000 lb track loader will do many jobs in about any ground conditions except pavement and concrete. Current JCB model is a 270T. Can't beat that side door! To lift a ton I would definitely go with a larger track loader. Put a set of forks or double bale spear or bucket or, over time, a grapple on it. Around here you can rent skid steer attachments such as an auger or mower, tree shear, etc. locally. 

Problem with buying a used track loader, like a fork lift, is knowing who owned them previously and how were they used and maintained. For example, never buy a used forklift that has been in a foundry, etc.

I've had luck buying near new or near new demo machines from a dealer on a say 5 yr note. Used to be low interest financing available.

I guess you could say my equipment mantra is to buy new on a 5 year note with the equipment (only) as collateral, maintain it well and drive it until it (or I) drop. This way almost any piece you buy is worth as much as you paid for it 5 or 10 yrs down the road plus you've had the use of a reliable, safe, productive, warranted piece of equipment for however many years you own it.

The goal is to spend more time with your wife and daughter rather than wrenching or hunting for parts or hydraulic hoses on a marginal older piece of equipment.

Good luck