Hi, I've sailed my 1978 Catalina 25 fin keel all over Southern CA and Mexico. I've sailed 2000 miles per year for the last 4 years. I've raced Newport - Ensenada, Crew of Two Around Catalina and the Border Run. I've single handed from San Diego around the Channel Islands 3 times and down Baja once. Nothing major has ever broken. Good boat, simple boat, solid boat. Parts available. Great owners group. Easy to find new or used sails - generally off the shelf. Factory support. There are some known weaknesses (like leaky windows on the old boats) to the Cat 25 but the owners group will tell you how to deal with them. Come to our owners group web site and download the guide to self-apprasing the Catalina 25 and do your own mini-survey before making an offer and doing a sea trial/survey.
You say the C25 is a fin keel and while it can be trailered, it is not really intended to be loaded and unloaded often. If you have to trailer, look for a swing keel or a newer wing keel.