Most if not all of the major freeways and highways in SoCal is packed in rush hour. Where ever your job is located might be a good idea to stay close by, if not expect to have an hour or an hour and a half of driving.

Check out cost of living websites on google. In there you'll be able to find more detailed information that fits you and your situation (not posting site to avoid advertising/bias).

As a person who has commuted to work 100 miles round trip a day for the past three and a half years.. find a job down here first. You should secure a job and see what city/area it's in first, then find a place that fits your budget and isn't ridiculously far away from your work. Saving a couple hundred bucks might not be worth being stuck in traffic for hours everyday and wanting to kill yourself on the 405 freeway.