You definitely have a case once the tests show you were not under the influence. Please don't let them off the hook. In my state, they can have a lawyer in small claims and you have the option to then get one.
I believe that you deserve compensation for more than the $500. Spending a night in jail, going through the humiliation of arrest and the trouble of fighting the charges should not be overlooked, especially since you have spent 50 years as an upstanding citizen.
I really think you should contact a lawyer. Most criminal defense lawyers are not interested in filing a claim against the police but there are a few civil rights lawyers for whom this is a small, but very valid case. Maybe the will do it pro bono (free) or on contingency (less likely).
I have been harassed by the local police for two years, since I moved here (CO). They have taken everything from me that I have worked for since I was thirteen. I will not stop in my fight to recoup my monetary losses ($150k) and clear my name. But I admit it is not easy. Nothing worthwhile ever is.
Please don't let them get away with this. It encourages them to go after other innocents when they should be going after real criminals.
I will have you in my thoughts that your charges are cleared, the officers are reprimanded or fired and that you are properly compensated.
Stay strong.