My normal maintenance (oil, filters and lubrication) are in the neighborhood of $300-$400. The more involved things like air dryer, transmission, coolant flush, etc. will add significantly when they are due. This year I am going to be well over $5000 due to having some major front end work, torsion bar and shocks replaced but this is certainly not routine stuff. I think if you budget $500 to $1000 a year for routine stuff you going to be fine. Just remember there are bigger things that will come along like tires.
Lenp