If your Monty is new, there is a good chance the front AC rough-in is ducted. If it is, I would recommend a Dometic Duo-Therm AC to take full advantage of the dual zone thermostat provided. If you use another brand, it will not be compatible.
A few indications to look for are:
1) A small round white sensor located on the closet wall near the TV in the bedroom, that looks like a small smoke detector (2nd zone temperature sensor for thermostat)
2) Parallel ceiling vents along the length of the rig
The Dometic Duo Therm models are HP, Brisk Air, and Penguin (low profile)
Dometic USA AC. If you're thinking about the heat strip, consider the new heat pumps instead - they are available in all the models listed above and produce far more heating btu than a heat strip. They are effective in ducted units, and you get the same btu/h heating as you do cooling when operating above 30 degrees.