Might be bit of an overkill for the Californian weather, but I mostly use the Sidi On Roads:
Very comfortable once worn in. They suit me nicely as I like to wear my boots inside the pant leg. I also prefer the old school plain black styling to the Star Wars stormtrooper look of most GP style boots.
On the minus side the On Roads do not have as much hard shelling as the GP boots, but gladly I have not yet had to test the level of ankle protection these boots offer.