Hi Gary,
Chad made some good comments that you want to consider. I'm not very familiar with the Power Trac, but I understand it is a very capable machine. You should also visit the Power Trac forum to investigate that possibility. That's the great thing about TBN, one-stop shopping! You'll be able to see all the options on this one great web site.
Since Chad has raised the subject of Power Trac units, it might be helpful to look at a
<font color="blue">Thread</font> Brian (now a Toolcat owner) started comparing the Toolcat to the Power Trac 1850 when he was making his own purchasing decision.
My inclination is toward the Toolcat, of course, but it does have some merits in your situation. The Toolcat may well be a more comfortable choice for your wife is she's not comfortable with a large tractor. I myself didn't have any experience with tractors, so the Toolcat having more of a truck/car feel to it made that a more natural choice for me. While the Toolcat is not a tractor, it does have a very powerful engine and a front-end loader with a lot of lift capacity. With the addition of a hydraulic grapple, it will provide her with a very versatile tool to move all sorts of material. The Toolcat has the auxiliary hydraulics already built in and control on the joystick, so all you need to do is pick up your root grapple with its skid-steer connection, plug in two hoses and you're good to go. My need was for moving logs, but very large rocks are also candidates as well as vines and scrub brush. Of course, there are also all the other skid-steer attachments that you can buy or rent.
Another thing that I found to be a powerful incentive was that all the work is done in front of you, even the mowing and grading, no craning your neck looking back all the time to see what's going on, as you well know from using the 3PH on your John Deere. And the visibility is incredible! With the bucket flat on the ground, if you lean forward in your seat, you can actually see the edge of the bucket on the ground!
And if you have kids that may want to tag along, then the Toolcat offers an advantage that you can't find in a tractor with its passenger seat. The enclosed cab and HVAC will control temperature and dust if that's an issue for her.
The Toolcat is not a tractor, but it can do a lot of things that a tractor can do and some things that a tractor cannot.