Bmac:
As DaveSisk noted, I have a Lackender hoe on my PT, which is an 1845. I have been really pleased with it, but I can't claim a lot of skill. I have a thumb on the hoe, and have used it for minor digging, but also to pick up brush and logs.
For the 425, Carpenter posted a picture a couple of months ago of his Lackender hoe, which was the prototype adaptation for the 400 series. If you search on Lackender, you can find the discussion and the photo.
I have scanned your questions and the responses from other owners, and have little to add except that figuring out what you want, looking and testing are great fun, and shouldn't be rushed. I don't hesitate to recommend Power Trac, but I do urge that you test one thoroughly before you make up your mind. A trip to Tazewell is too much fun to be missed, but as Bubenberg has often advised, don't take a credit card. You will end up with a lot more attachments than you planned.
If you buy a machine, they'll give you a course on how to maintain it. (I didn't have time, but I hear it is pretty good.) The manuals are poor, but you'll find you can figure things out pretty well. If not, you are bound to have a buddy who will help for a six-pack.
If you really have no desire to do any maintenance, the Kubota may look better to you, but I don't know of anything on a PT that a tractor mechanic for nearly any other brand would find hard to handle. You just have to find a good mechanic, which is always a bit of a problem whatever you buy.
Happy hunting.