Sounds like you're well on your way to tractor ownership. There'll be a few times you may wish you had the HST tranny, like when you bang your left knee up and it really HURTS to hold the clutch in (been there), and then there'll be times when you hear that diesel come back to a sweet idle every time you take your foot off the throttle (done that and still smiling). I like my DT 95% of the time, so that tells me I made the right choice for me.
I don't think the L4600DT has a synchronized transmission, so if you don't already know how, you'll be learning how to double-clutch to shift smoothly on the fly, and learning to leave the clutch depressed to let the gears spin down for a few seconds before shifting into gear from neutral (no grinding).
Yeah.. I AM gonna take the opportunity to welcome you into the Real Tractor Owner's Association (secret handshake info is in the mail
) and pull the tail on the Ol' Ladies HST Tractor Association members we have here. I'll pay dearly for that poke, you realize.
A rear blade with power angle and skid shoes (since you now have rear remotes !) is handy for snow removal, the bucket will do it but it's not that neat and tidy, neither is it efficient. I don't have a box blade, so I can't comment on them. If you do get a rear blade, get at least a 7 footer, an 8 would be better for snow. Mine is a 6, a seven would have been better, but used + cheap = mine.. The reason is, you want to be able to "wing" the snow back to each side with the blade angled while still staying on the roadway. Snow has a habit of piling up then tumbling back into the path you just cleared. I offset my blade to one side (usually the right) to get the blade as far out there as possible. Hydraulic angle control is a Godsend, no more hopping on and off all day in the winter.
Since you're getting Ag tires, check the loader manual and the tractor manual carefully for the recommended inflation pressure for the front tires WITH LOADER USE. It's usually quite a bit higher than normal pressure. I ruined a set of fronts on mine, possibly because of that.
Good choice on the rotary cutter, Land Pride makes a good one. Like TripleR said, the chain shields are a good idea, I made a set for mine before I realized how much work it would be.
Logging, even for firewood, makes a log winch a really attractive item. I bought a new/used one last year, saved a few hundred bucks plus the tax and wouldn't part with it. Saves a lot of cutting roads or driving through stuff I really shouldn't.
And finally, tire chains.. you're probably going to want them for the rears at least. If you don't have asphalt driveways, these are the cat's azz for around the woods, fields, gravel drive etc on ice or in snow.. made by Tellefsdal, sold in the US and Canada as either Norse Super Tractor or Aquiline Talons. Pricey, but you really do get what you pay for.
Welcome to the forum !
Sean