I think it will be hard for anyone to give you a remotely accurate answer Luke, there are so many factors to consider.
For example, you haven’t mentioned the age of the aircraft you ask about, this affects more than the purchase cost, remember to consider maintenance, fuel consumption, insurance. Then remember things like hangarage can vary wildy depending on location and quality.
Some more info and there will most likely be a few people who can give you an idea on some figures, but with the info you have given, any figures would not be reliable.