You could have expected stuff, and unexpected stuff.
Expected...
Engine oil - probably $80 at the Quickie Lube
Tranny oil - $70 + labor
Brake fluid flush - $75
Differential fluid - $50 + labor
Power steering fluid flush - $20 + labor
Clutch fluid flush - $5 + labor
Spark plugs - $15 + labor
Plug wires - $30-$150 + labor
Coolant flush and fill - $75
Air filters - Clean or replace, $? or $75
These are all done based on either time or miles. You will have to know what has already been done, how many miles you plan on driving annually, and what you consider to be important.
Also, brakes and clutch are normal wear components, but less expected. The clutch slave can also go out. You will need a battery every so often, and will wear rear tires.
$300 to $500 per year should get you by, but depending on like I said, previous work that has been done, how well you want the car maintained etc. $500 should also leave a little leftover for the clutch and brake jobs that can get really pricey at a dealer.
All the above is why I'm mechanically inclined and do it my$elf.......