I'd go along with 30-40 hp. which one is up to you. You don't need a lot of hp for what you're going to be doing, weight is a factor though. I've been pretty happy with the L3400 Kubota I've got, doing pretty much the same chores, so anything in that size range should work for you. Funny how jobs you used to hate BT (Before Tractor) become almost a pleasure to get done. Seat time...
Look for something with rear hydraulic remotes before it ever leaves the dealer if you end up buying new. AG tires are another point, as are weighted rears. Make sure you have enough room for tire chains if needed.
30-40 hp will be fine around the woods (firewood), just don't plan on hauling out 3 cords at a time. I can usually get at least one good size (16 inches at the butt) tree behind mine, with everything that's worth taking for firewood from it. Usually two depending on how many big limbs there are.
Don't worry about the PHD use, they're not power demanding. Down pressure from the digger might be a good thing to look for, or go with a bucket mounted hydraulic unit. They work really well, but are pricey. Most of my implements are either used or home-made, unless they've been abused most will respond to a little TLC.
A 3038 or 3720 Deere would fit you well, a cab will depend on where you're going to use it and how much you mind the weather. I like the open station myself, especially in the woods.
Chilly