I would definately go to court. The chances that the cop won't show up is about 50-50. Not feeling lucky? Go to the radar people's website and other places on the web that shows radar is NOT infallible- it has to be hooked up to a continous power supply (NOT the cig lighter socket) you have to be out front on level ground, and there are lots of other factors too. Find them all out and print them out for evidence.
Cross examine the cop in court- ask him if/when he was in radar school. Ask if when he graduated radar school, did he recieve a certificate of completetion. Then ask if he brought a copy of that certificate to court with him. Then ask who calibrates the radar gun. Then ask how often they do it. Then ask if he keeps a record of this calibration. THEN ask if he brought a copy of that record to court with him that day. For everything he failed to bring, that discredits him- what he said was heresay without proof. Then point out in closing arguements that there is reasonable doubt that you were running above the speed limit- you proved radar isn't infallible, and the cop didn't bring documentation to back his claims, but you brought stuff to back yours. They should throw it out if you have some good stuff printed.
One final note- when you are presenting your evidence the prosecutor will make excuses to throw it away peice by peice "this doesn't pertain to this case" or whatever. Say "I OBJECT!" to anything they try to throw away and explain to the judge why that particular document is important to the case. He will normally let you keep about half of the stuff but should be enough to win. The more research and homework you have, the stronger your chances of winning...