Over 6000 Catalina 25s were built from 1976 until 1991. Hull #1 is still sailing today in Texas, and is still in good condition. Through the years, many improvements were made. The more significant ones were that, in about 1980, the fuel tank was placed in a completely enclosed compartment, so that gas fumes couldn't migrate into the cabin. Also about that time, the motor mount was moved from the port side to the starboard side, to balance the boat better. In about 1983-84, the cast iron fin keel was replaced with an encapsulated lead keel. In the mid-eighties, the swing keel was replaced with a wing keel. In the last couple years of production, the aluminum-framed portlights were replaced with lexan that was screwed and glued in place. Despite these changes, a well maintained older boat can perform just as well as a newer one. Throughout its production run, a C25 could be bought in either a standard rig or tall rig version. The tall rig is considerably faster in light air, but, as the windstrength increases, the tall rig has to reduce sail area sooner than the standard rig boat, and the standard rig boat becomes faster overall.
Beginning in about the mid-1980s, most, if not all, of the boat manufacturers began to have an increasing problem with blisters, and Catalina was no exception. The most reliable information I have is that, in about 1989, Catalina started building their boats with vinylester resin, and they began warranting their new hulls to be blister-free for 5 years. When I sold my 1981 boat last year, it only had one very small blister, so blistering was not as severe or as widespread a problem as one might think. Some boats had the problem and some didn't, but the problem seemed to me to be most evident from about 1984-1988.
The C250 went into production in 1995, and it's completely different from the C25. It's much lighter in weight, has a flatter bottom and harder chines (which makes it behave differently as the windstrength increases), and the interior is more open. It comes with either a water ballast and centerboard, or a wing keel. I can't say with certainty whether one is faster, because I've seen both types that were fast when well-sailed, but I'd guess that the wing is faster overall. At first, tall rig and standard rig versions were available, but after a year or so, the tall rig was dropped. The tall rig is very fast in very light air, but, as the windspeed increases, it becomes overpowered quickly.
With regard to trailers, there are two general types - trailers with fixed bunks and those with roller bunks and swing arms. It's generally much more difficult to launch from a trailer with fixed bunks than from one with roller bunks and swing arms.
The galley is located wherever the designer can fit it into the interior plan. In some plans, it works better on the starboard side, and in others on the port side.
The following is an alphabetical list of boats that I like. Some are more cruiser-oriented, and some racers. C&C 25, Cal25, Capri 25, Hunter 25.5 (mid-80s), J24, Merit 25, O’Day 25, S2 7.3, US Yachts 25 (early 1980s) These are just the first ones that come to mind. There are a lot of nice boats out there.
In the dark recesses of my mind, green reminds me of puke and baby sh*t, and that's reason enough to not paint your sailboat green. (Not that there's anything wrong with it...)