Go for a 300c, I have run them for 14 years and have only ever had one big bill on unschduled maintence ( £ 6500 for a transmission problem ) The rest of the bills have all been component changes.
My last annual on an ac that had flown 400 hrs in a year was £ 3500, the previous 300 hour inspection £ 650, last 200 hour £ 450 and 100 hour was £ 250.
Insurance on one should be £ 4000 to £ 6000 depending on value and type of insurance. Fuel consumption is 50 litres an hour
You can also get 3 people in and 49 gals of fuel in it - yes it will lack performance and is cramped but she does it.
You can buy a good 300C with half life items for around £ 65 to£ 75K. Bear in mind there is no calender items on the machine.
However DO NOT STORE OUTSIDE, if you do your bills will double.
PM if you want my phone number for a chat.