I has been my experience that the Catalina 25 is one of the best boats around for the money, however the swing keel version in my opinion is one of the worst pigs I have ever sailed. Both it and the Beneteau 235 seem to be quite tender, so be prepared to reef early and often.
I haul boats regularly as a side
line and the the C 25 and Beneteau 235 are easy enough to step the mast on, I have stepped a C25 mast by myself on two different occasions. Don''t try to step the mast on the Beneteau by yourself as the alloy mast step is terribly brittle and will snap off wit the slightest twist.
I have no experience with the Compac or the O''Day 240.
May I suggest the O''day 25 centerboard version. Most of these boats are getting a little age on them, but there seem to be a good number of them out there that are still in wonderful shape. You can buy this boat in the same price range, often with a trailer, and they sail so much better than the C 25 swing keel or the Beneteau 235.
Good Luck
Dirt