1) Shop around for a new Insurance company. Most will forgive one minor traffic violation every 3 years.
2) Make the charge "minor". Discuss your dilema with the prosecutor at the court address on the back of your ticket. See if he would be willing to change the charge to "Disobey Sign" so that your insurance will be affected as little as possible. The fine won't change (might even go up a bit), but the insurance increase is the real problem. Cheerfully pay the fine if he will allow you to plea down. He will have an interest in avoiding an expensive trial as much as yourself.
3) Check option 3! Even if you plan to plea bargain later, option 3 will give you more time. More time is very important if your insurance is coming due any time soon. You want your court date to come up AFTER your renual. This will give you one more year on your OLD rate (should your rates increase due to a conviction).
4) Read the "steps" at TicketCombats site.
About Plea Bargaining:
http://www.cbc.ca/consumers/market/files/cars/tickets/
TicketCombat:
http://www.ticketcombat.com/
NOTE: You would never "make something up" at trial. Your only intention for a trial would be to question the officer about his training, the equipment used to register your speed, and the calibration and proper use of that equipment. If the officer doesn't show up for court, you're case will likely be dropped.
I'm currently assisting a co-worker who just got the same ticket (90 in a 60... in one of those very short small towns you encounter now and then). It's worth noting this co-worker quite frequently announces that he NEVER speeds and is quite unapologetic for the lines of cars that form behind him. Just shows that ANYONE can get a ticket these days. The cop listened quite intently as he explained how this was just a fluke, and that he NEVER passes other cars, blah, blah, blah... Then the cop said it's his policy to never reduce charges on the side of the road and passed him his ticket.
It's worth noting that this co-worker's brother is a Cop, but his first call when he got home was to ME! LOL