When we decided to get a bigger boat, (we had a Capri-18), We also wanted a C-250, water ballast, with the wheel steering,(serious "cool factor"!!). I searched and found one, but at the time we dry-sailed our C-18, and the C-250 was not able to be lifted by our crane at the club with a sling,(not recommended by Catalina). Our BIG reason was "pottie-privacy" with the C-250 and her enclosed head. So we decided to go back to a C-22, and found a wing keeled MK-II version. The C-22 had the "pottie-privacy" we wanted, but I didin't like having to move it at night if we slept in the V-berth. And I didn't like having to back into the V-berth, and found myself sleeping on the MK-II's quarter berths, (completely different interior that the old C-22's). Then I got looking at the MK-II's V-berth set-up one day, and with a very minor modification, I turned the V-berth area into an enclosed head with luggage storage. Our head has the same headroom as a C-250 water ballast version, but much more room, (but no sink). It's like a handicap stall! The C-250 would have required a 3/4 ton truck,(from C-250 owners advice) so with the C-22 I could keep my Ram 1500. Now depending on your situation, our C-22 only sleeps 2 now, (YEAH!!!!!), same beam as the C-250 at 8'4", and the C-250 water ballast only has 4" more headroom in the cabin than our MK-II. Granted, no cool wheel with my C-22, but instead I have an autopilot with remote, which is much cheaper. Good friends have a water ballasted C-250 and I was surprized how stable it is!!!, but they still experience some centerboard clunk, even with some carpet strips glued in. Nice boats, but for us, the C-22 MK-II just looks better, sails better,(points higher and is faster that our friends C-250), much less windage issues due to the hull profile of the C-250, the MK-II takes more wind before reefing is required than their C-250 WB, so I'm sold on the MK-II wing keel version. Also, the MK-II wing keel only draws 8" more water that your swing keeled C-22 does with the keel raised, so launching differences in minimal.
Good luck! At least your head is on straight staying in the Catalina family.
Don