Well, since you asked for opinions, I'll throw mine out there...
People should remember that experience and effort are relative. What may be easy for one person might be difficult for another, and vice versa. I think all three of these hikes would be easily done in a day.
I have literally run the Kinsman Ridge trail over the Cannonballs in winter and it was pretty nice. I don't understand why it has been described here as nasty, tedious, boring, etc... I liked it just fine. Kinsmans + Cannon is a great choice. I think it is 12.2 miles if you descend to the ski area.
The Franconia Ridge traverse is a classic trip. You could go either direction. I would avoid the Greenleaf trail since I didn't enjoy it last time I was up there - I much prefer Old Bridle Path. Climbing the Flume Slide trail was fun but not as tough as you might expect. Descending Osseo to Lincoln Woods is a fine choice and the car spot is a 15 minute drive at most. You could also backtrack after hitting Flume and go down Liberty Springs trail. (This adds a little more mileage and elevation, but nothing outrageous.)
The southern Presis sounds like a nice trip. I'd second Sherpa Kroto's suggestion to add Monroe, just so you don't have to go back for Monroe when you do Washington.
Bring cash when you go to Guyot shelter... I believe there is a caretaker there this time of year, and it costs between $5 and $10 per person per night. Best sunrises in the Whites from your sleeping bag inside the shelter! You might want to stash a couple of your packs near the summit of Guyot when you go out-and-back to Zealand. The rest of the trip sounds fine, and you could potentially take the steep route down South Twin and go grab Galehead, then take the beautiful/easy Gale River trail down.
These are my opinions. I realize my itineraries are more aggressive than most, but that is just how I hike. If you're staying a week you could schedule in a couple off-days or bad weather days to recover if need be. Have fun!