Your second son should have plenty of UC and CSU choices (though he should apply widely, not just to UCB and UCLA), and probably plenty of merit scholarship choices to try for as well:
http://automaticfulltuition.yolasite.com/
http://competitivefulltuition.yolasite.com/
http://nmfscholarships.yolasite.com/
If he has a natural bent toward frugality, you may not need to worry too much about him spending more than UC costs, though be sure he does know that UC costs are your contribution limit. A natural bent toward frugality will also help him in other ways, since he more likely will not be forced to chase the money at every decision the way high spenders often need to in order just to stay financially afloat.
Your first son’s college may be more expensive if he does not go to a UC or CSU. Arizona State out-of-state list price is significantly higher than UC cost (probably by about $8,000 to $10,000 the first year in on-campus dorms, probably by a greater amount in later years when most UC students move to cheaper off-campus housing). NAU with WUE pricing is a few thousand dollars lower than UC cost in the on-campus dorms. Another option is to start at a community college and then transfer, perhaps to a more desirable UC or CSU than he can get into as a frosh, if he does better in community college than in high school.