I played Seacliff twice in the past 3 months, and for the money I personally do not think its worth it at all. The course has some length to it yes, but not a great course at all. Its packed and nothing special. Only thing I will praise is that it has a nice driving range, nice clubhouse, and people seem to be very nice and decent.
I agree with Mesa Verde, nicer course by leaps, good people, better place to join.
Newport Beach CC is a carnival show. It is packed, there are about 750 active golfing members who take full advantage of their membership which leads to chaos even on weekdays. Nice place, nice course, but again not worth it in my opinion.
I was turned on to Hacienda not long ago, and for reason of joining a private club, this could be a great one. Nice people, great clubhouse, and very good course. Hard course as well! Nice history with the place (Tiger Woods stuff), and even on weekends its not packed. Good condition, greens were perfect both times I saw it, and more of a North East club feel to me.
Might also want to check out Virginia CC in Long Beach, I think they will be renovating it or fixing any problems they might be having with it, but another decent/good private option.