Many years ago I was pulled over by the CHP doing approximately 115 on a motorcycle. It was early on a Sunday morning, with almost no traffic on the fwy. The officer advised me that over 100 was a trip to jail, at her discretion of course. She wrote me for 95, and told me to watch my speed. She could have arrested me, as well as had my bike impounded. The amount of street racing and injuries/deaths associated with it, have caused the state to get really tough on speeding.
Just FYI... here is a link to the CA DMV General Speed Laws:
http://www.dmv.ca.gov/pubs/vctop/vc/tocd11c7a1.htm
... and a link to the law that governs exceeding 100 mph:
http://www.dmv.ca.gov/pubs/vctop/d11/vc22348.htm
You got off easy as far as the ticket goes, but in court you might find that the judge is not as accommodating. An attorney would definitely help, but be ready to shell out some clams... when I got a ticket last year for a right turn on a red light, (at an automated surveillance intersection), I checked into a lawyer and found that it was going to cost me a minimum of $2500.00 to fight it. Maybe you should just bite the bullet ask for leniency from the judge on the first ticket, then pay the fines and go to traffic school on the second one. If I remember correctly, the fines are $5 for every mile over the speed limit, plus the court assessments, which are somewhere between 50 and 100% of the fine.
Good luck whatever you decide.
Oh, and I believe that your insurance only sees what the infraction was, not the circumstances... but don't quote me on that. Anyone here an insurance agent??