Hi 5Flgirls!
Seems like you have had a lot of change recently... (I peeked at the moving thread, too...) One option you might consider--probably not for long term but as a short term (six months/year?) approach--is staying where you are in South OC (San Juan Capistrano?) and then your husband commuting to his job in Del Mar. This could allow you to stay in your current area and give your husband a chance to check out the job and make sure its a fit without too much upheaval on you and the kids. If it's a fit, you could move down here next summer or during the winter (school) break.
Of course, this means a long (and sometime awful) commute for him, which also means he will be home less... My boyfriend currently does this in the opposite direction, from Carlsbad to Irvine (about the same distance). He generally takes the train from Oceanside to Irvine--1 hour 10 mins doorstep to doorstep, but no traffic stress. Amtrak has a stop in San Juan Capistrano and also in Solona Beach (just north of Del Mar) so depending on your locations and times that could be an option too (the train provides some "downtime" before getting home

). Some San Diego employers are pretty flexible with start/end times and also provide some telecommuting options... Some employers also allow you to "work" on the train...
Of course, if you think you're going to end up down in the San Diego area it might make sense to just go ahead and get here. You might also consider Carmel Valley as an area--I have friends with kids (ages 6 and 8) who really like it there (safe, good schools, lots of kids/moms, etc.). It reminds me of a little "OC pocket" in San Diego. Very close to Del Mar--zip is 92130.
Good luck!