If you bring some sp5ks in.. you can easily fetch 5-6k a piece.... (only thing you will have to do is modify a washer to a c-shape.. so the mag release does not work unless you take the grip frame off...)
Having lots of gun-friends over the border from me (I'm in AZ) I hear every sort of horror story. Any gun law there can be interpreted to the suit of whatever cop you happen to be stuck with. The 'spirit of intent' doesn't mean crap in most cases.
IMO, leave everything in CO, even though that might not be any better soon.
Take one piece with you for self-defense, one you might not mind too much if confiscated.
This, save the money you'd spend complying to move back out of CA
Or bring them all and just don't talk about them