I'm installing a genset this year, mainly because my lungs are shot to Hell and it makes breathing a lot easier when I can run the boat's AC system. The one I'm looking at is the Ryobi 2200, which sells for half the price of the Honda 2000, has better specs and is only slightly louder in DB. It also has an idle feature, which allows the generator to drop to idle speed when there is no load. Generally, it's quiet enough to hold a conversation at normal level within 10 feet of the generator running full power. I like that.
I'll have to build a special platform for it on the boat's stern, something similar to a swim platform. I know guys that hang them from the stern rail, but I'm not happy with that arrangement, and I think the platform would provide better protection from exhaust fumes coming into the cockpit. I do, however, highly recommend installing an explosive gas alarm in the cabin, just to be on the safe side. The alarm detects all gasses, including carbon monoxide, even in the tiniest amounts. The alarm is loud enough to wake you from a deep sleep.