Thank you for your replies. I will try to answer some of your questions.
1) I am pretty aware of the cost for maintenance, insurance, slip fees, etc. I have researched them and contacted my insurance agent.
2).Yes, the $25k is in C34's pricing range. I've been wanting a C34, but the slip fees will be more expensive. I really don't think I'll want to purchase a C30 for $25k, that is why I am asking everyone in here about your thoughts (especially with financing). I know it has to be under $20k or even at $15k. I will ask my surveyor for his opinion. The C30 I am looking at has almost everything, like autopilot, chartplotter, radar, AIS, new mainsail, recently painted bottom, etc. This boat checks most of my boxes.
3) I have contacted Cabrillo Marina in San Pedro, and they said they have slips available for a 30' sailboat. Alamintos Bay and Shoreline marinas are full. I will ask them to put my name on their waiting list for Shoreline/Alamintos.
4) I have an excellent credit history. My wife and I are retired. Our house is 99% paid for. I don't have a problem getting a loan. My credit union has known me for years (I went through many car/truck loans with them).
5) There is a C34 for sale in San Diego for $21k. I obtained a copy of surveyor's report (selected pages) from the broker. After reading it, I've decided not go with that boat. The stove is CNG, which I don't want to deal with (due to the high compression in CNG tanks, it's challenging to find someone who can refill them, etc.). I refuse to refill the CNG tank by myself; it's scary. The C34's electrical wires are in poor condition.