The last two answers are the best scenario for you - to rent your property out. Yes, you'll likely have to rent at your next destination, but unless you like losing money, renting your present house is the best idea. The rental market is good in South Orange County, at the moment.
You might even find that you'll be able to purchase a home at your next destination with no money down, or, if things are tight, it would probably be best to rent there, for a year or so.
It also depends on whether you will ever be coming back to Lake Forest. If there's any chance that you would, it would be best to have a place of your own to come back to.
I started my career in Lake Forest over 32 years ago, and have numerous local clients that I work for in getting their places rented. I would be pleased to sit down with you to discuss all the merits of each choice, to help you make the best decision. Please feel free to call me at 949-643-2100, or send me an email to Bob@BobPhillips.net.
Good luck in your decision making!