Ouch. I believe this question is in the category of 'if you have to ask you cannot afford it'
Engines ~60k per side TBO 1700
Props ~15k per side TBO 1500
Insurance .. ouch
Parking/Hangerage..?
As for maintenance charges.. nfi. But all up the thing'll cost around $300 per hour to run (dry), assuming you do 3-400 hrs per year (including provision for the above costs)
Bevan..