Hi kcook,
As MR has suggested in posts way back, might be good to make a list of what you reasonably anticipate doing. That should also help with your choice of the machine, too. Not only should it help with selecting a PT vs some other CUT, but also between the 425 and the very able and powerful 422. Put a ROPS on the 422 as Stray has done, and all of a sudden you have a great machine AND lots of $ with which to buy other toys....er, I mean implements, of course.
From my few hours seat time experience, the 4-in-1 seems to have wider range of utility for my basic landscaping needs. With open jaws, you can back drag or rake. You can also dump to a pick-up w/o having to raise the load too high (read that as unstable). Just move the closed bucket over the pick-up bed, and then open the jaws. Voila! Dumped with precision. Almost looks like I know what I'm doing.
MR's comment on snow removal is right on. We don't get much here, but others have told me the same. If you need to remove snow on a regular basis, a snow blade would be a far better choice.
Size of the PT 4-in-1 bucket is close to the size of their regular small bucket. From trying it at Tazewell, it picked up about 80-90% of small bucket volume. Smaller bucket means more trips. If that's an issue, then I would consider the larger bucket. It's made of the same material as the regular bucket, so the perception that "light materials" means cheap or weak construction is a false one. Your limit with the large bucket is the # lbs you can SAFELY raise before the PT tips on its nose, the infamous "PT Pucker." If I had to choose between the small or large bucket, I would definitely get the large. It's not so large as to be awkward, and it can do all the small bucket can and more.
Choices, choices, dictated by money, money... Why is it always that way??