The first casualty of your figures is likely to be the number of hours you intend to fly a year. You write about buying the aircraft with three others and flying 200 hours pa (average 50 hrs PA each). Very few private owners manage to fly that amount with 25-30 being a more reasonable norm.
Last year I managed 63 hours in my own aeroplane, mainly because she lives in a barn at the end of my garden and I have access whenever I want.
The person on this forum who has most likely done a full analysis is IO540, if he doesn't crop up here shortly try sending him a PM.
SND