I'm planning on moving to CA next year- I'm probably either going to sell it, leave it here with my father, or break it down and put it in a safety deposit box. As for ARs in CA, there are legal ones- You can get one without any bullshit except the 10-round magazine as long as it's not manufactured by a big compnay, which would normally put it on their "assault weapons" list. Or, you can buy an AR with a detachable mag, a full non-pistol stock and without the other scary, evil features. Or you can buy one with evil features, but a solid, stationary magazine. He probably has a Vector Arms "Mp5" that was grandfathered in before the ban. CA has its head up it's ass. =/
I'd suggest my handgun, the PT99 AF. It's a copy of the 9mm Beretta 92FS with a frame-mounted safety. They generally go for $350 and are a great value.
If you want a .45, go for a Rock Island 1911-clone. They're around $400.