Another C320 choice
I too went with the C320 (#831) rather than the 310. The C310 seemed too claustrophobic for my liking, but I generally cruise with a crew of 2 or 3 plus myself; for just two people cruising (or maybe 3), the 310 might be fine. I suspect the 310 & 320 are generally similar in regard to performance & options.....Again, the 320 has an ample "owner" (stern) cabin, a V-berth that I can stretch out my 6'2" frame in, and the larger salon that sleeps a few as well. (Actually, I often prefer sleeping on the port salon bench.) Storage is adequate for short cruises (7-8 days) with a crew of four. I have not even bothered to attempt to shower in the head! A lot of cleanup required and very limited maneuvering room. Sponge baths the rule at sea or on the hook; a marina every few days for a real shore shower! The holding tank capacity with any sort of crew can be a problem; pump out often.The boat handles quite nicely under sail or power. With the 135% Genoa, it doesn't move too well in very light air (a whisker pole would probably help), but I've rolled it up to 100-110% and reefed the main and rode very comfortably in 28-33 knot breezes. 12 to 18 knots of wind is ideal. Fairly stiff, too. With DonG's book-learning (Sail Trim Forum) I can balance the boat well enough to leave the wheel hands-off for extended periods.Under power, I find the engine noise is excessive. When cruising, we often must resort to running under power to make it through the Cape Cod Canal or Wood's Hole or the like to keep on a tight schedule port-to-port. I got the 3-blade prop for extra power while cruising or maneuvering in harbor. We don't really notice any significant drag while it's locked under sail, but I've never actually checked it against another boat. Don't much care, since we don't race.The 27HP Yanmar is adequate for the size boat, but performance drops off in any sort of stiff headwind/wave situation. Last year we left Portland, ME with a full tank and had to motor all night at 2800 rpm into 23-28 knot winds on the nose & 3-5 ft seas; barely maintaining 3.6 knots. Almost ran out of fuel by the time we got to Gloucester, MA. In less stressing conditions, it just sips fuel at 2500 rpm and can run at 5.8 - 6.0 knots.I looked at installing sound suppression material, but figured the job too difficult for any potential return -- just not a lot of room "under the hood" and it would involve much custom fitting in awkward places; a lot of stuff had to be unmounted on the port engine compartment "wall," too. The engine belts & pulleys are very close to the forward engine cover (under the ladder) too. The aft cover has complex curves difficult to fit. If ordering a boat from the factory, ask about having them do an installation as an option. SoundDown in Marblehead makes good stuff for that purpose (link); make sure you use sound suppression material with an appropriate heat/fire rating.I have an integrated Raytheon Autopilot, GPS, Radar, Chartplotter, Wind, Depth, & Speed package. Works great! Wednesday I sailed almost 20 miles up Cape Cod Bay and through the Boston shipping lanes in pea-soup fog and we maintained terrific situation awareness. The decision to invest in that gear was worth every penny that day.We also have a dodger that keeps the rain off the deck crew and (usually) out of the cabin. In sunnier locations, the bimini would be another good option.Hope that helps you decide. Catalina builds a great boat for the money.--RonD