A brake fluid flush is never a bad idea, but I recommend getting it done every two years, this will help with brake feel and prevent the fluid from boiling. More importantly it'll help prevent corrosion in the brake lines.
Air filters you can simply change yourself, you can stretch it to 20K, but honestly get a couple K&N filters, which is approximately $80 bucks since your require two and replace them yourself.
As for wiper blades, well that's your discretion, are your wiper blades worn? I don't drive my car in rain or snow, so my wipers will never need to be replaced.
Engine oil is a must, my dealership offered me free synthetic oil changes for 3 years, Mobil 1, as part of the purchase contract for my Z.
Cabin filter, yes if you get a musty smell when you turn the a/c on, if not you're okay. Be advised the cabin filter effects the air you breathe, and mold can build up in it.