Add in $5000 to 10000/yr for unforseen expenses. Such as Vac pump failure,radio problems ,transponder problems /checks ,instrument 2 yearly re adjustment and repairs,spark plug failure ,mags overhaul, battery replacement,tyres, oleo repairs, paint touchups, corrosion removal,Landing fees.Prop filing due stone chips,trim repairs. The 100 hour service is only half of it. Take it from an owner. If you are still intent on buying an aircraft at least buy a 4 seater. Far more versatile and if you must hire it out more in demand.