Cal25 owner here, nice little boat.
Best advice I can give is to meet some folks and crew on as many different boats as possible. Figure out if speed/performance or cruising/stability is more your style. A floating camper is much different than a J105, event though they might be similar size.
I found a solid cheap Cal25 for a first boat. I plan to upgrade sometime soon, but only after figuring out what I really want out of a boat.