In New Jersey it is not a good move. If you refuse to submit to a breath test, you will not avoid penalties. Instead, New Jersey law has separate penalties for Breathalyzer refusal. If you are a first-time offender, you could face: License suspension of seven months to a year.
I think every state now has implied consent so that you will lose your license for a period of time if you refuse the official breathalyzer at the station.
That is not the case for the tests in the field, (balancing tests, eye test, breathalyzer, etc.) which are the tests that you can and should refuse unless you are absolutely sure you are under the limit. All of the field tests are designed for the taker to fail. There is no down side to refusing the field tests. The only potential upside to taking the tests is that if you are clearly under the limit the cop may not force you to go to the station for an official breathalyzer. Make no mistake about it - the cop wants to arrest you for DUI. Everything he does and asks you after the stop is intended to be used against you. Don't help him. (I am a lawyer.)