If it flys, floats or f***s, rent it. That's nearly $700/hour in maintenance alone before you add in fuel, hangar, insurance, depreciation and loss of interest from not having the money in the bank.
As someone previously said, if you're only doing 50 hours a year ownership isn't the best way to go. Get rid of the aircraft and charter a King Air instead. Nicer ride and you'll be quids in pocket.