there are many, many catalina 22s on our lake. almost all are swing keels.
for a cruising atmosphere go with the MKII for sure. the galley layout is a big improvement. most people I know with the earlier boats don't even know where the the slide out galleys are anymore b/c PO's have thrown them out.
if racing the boat is your thing, a hull number under 1000 = light and fast.
the maintenance of the swing keel is really not an issue in fresh water unless the boat has been seriously neglected. a look at the volcano below the keel winch and the hose above the volcano will tell a lot about the condition of the keel gear.
the wingkeels are interesting and somewhat rare, but two big cons are significant loss of pointing ability and ease of trailering.
see also this website for lots of good info. "Chip Ahoy" Homeport
hope this helps.