Hey John, thanks for reaching out. I would suggest the X580 at the minimum because it has hydraulic lift and power steering. You can use the lift to keep the snowblower/blade slightly up off the driveway stones. A front implement makes the steering a bit harder, so for that reason I like the power steering of the X580 versus the manual steering of the X570. If you bought the X570, it has a foot pedal lift system, meaning you'd have to use your foot to hold the front implement up off the stones. I would steer away from the X750(diesel 2WD) unless you prefer diesel. I'd go with the X738(gas,4WD) in that series. The mower deck is drive-over, auto connect, and the 4WD makes getting on and off the deck a breeze. Swapping from mower deck/bagger to snow mode is a breeze. It's gas, liquid cooled, and 4WD. It's the ultimate snow machine, and it would have the largest capacity bagger available for your leaves.
With regards to snow equipment, I'd go with a snowblower for sure. Nothing worse than a snow blade on stones! BUT the blower and blade use the same quick hitch, so you only need to buy just the blade part if you go with the snowblower because you can re-use the hitch. You may have to get a little creative with the skidshoes to keep it from digging in, but it looks like you're already accustomed to that. I still like the X738 in this regards too because it's all shaft drive versus the long belt drive on the 500 series. (nothing worse than blowing a belt in the middle of the job) Hope this helps! FYI, some dealers still may have 2022 stock on hand, which will have a price advantage over 2023 models. The link below will take you to Deere's site, where you can view more info and the brochure. Please reach out if you have any questions!
My suggestion:
X738 w/54 or 60" deck with MC519(Cart) collection system or 3 bag or dump from seat bagger system, and 47" snowblower (54" snowblower is overkill in my opinion, and 48" mower deck is too small)