For a first time offender at 152, you're in the best situation you can ask for.
Varying fines are usually there for individuals who wont learn their lesson or break speed records.
Whatever the conviction, that's what will show up on your abstract. If it's 149, then that's what they'll use.
Your 7 day suspension will also be on your record. Since it's a roadside thing, it's considered an administrative suspension. Your provider is not supposed to use that suspension to calculate your rates.
Any conviction that carries potential jail time is probably worth considering a paralegal no matter how unlikely the possibility that you'll see any.