I wouldn't feel comfortable with a unit used by the municipality and no warranty. Those guys are hard on equipment because they don't pay the bills on it. Why would they trade it in with only 450 hours anyway. That's just my own thinking. I would feel more comfortable with the low hour 3320. unfortunately, that does not have a cab. I was out mowing fields and moving mulch the past 2 days in disgustingly hot and humid weather and I was in a very cold comfortable setting with my cab so I couldn't imagine not having a cab at this point. Although I did do it without a cab for many years. it sucked. Sounds like the cab wasn't that important to you in the first place so I would recommend to you to go with the low hour machine. the 3320 is a stout machine with plenty of power
Those prices are venturing into "new" territory pretty closely. I'd do a bit more looking around before jumping at either tractor!
I would go with the 3720 cab. Take an oil sample and send it to Blackstone labs - this can tell you if there is any wear based on the metals and elements in the oil - I do this on my larger farm equipment and my diesel trucks.
dschuffert, do you do this with both the tranny and the engine, or just the engine? I'm actually more concerned with the hydrostatic transmission than I am with a diesel engine.
Im taking delivery of my 3320 cab this coming week. Im going from a 2320 open station because I cant handle the dust and grass anymore. I would mow for 3 hours and then have sinus problems for a week. For me the cab option is cheaper then a week in the hospital for having pneumonia. Like others have said , once you get a cab you will never want to go back to an open station.