Hey Suzi,
Welcome (soon) to Beautiful Montenegro 
I am personally driving the car that I brought back from France, and therefore I can only get "third party" insurance (would this be the equivalent of the one you mention?). This costs me c. 250€/year.Â
If you buy a car locally (usually more expensive than in other European countries) I do not know the costs of insurance, maybe someone else can assist.
As for accountants, they would usually charge c. 100€+vat per month, but then it depends of the volume of works. If you have 10 or 1.000 transactions per month, of course the price will vary.
Cheers!