To accent what Carl said, you pay for a plane you won whether you fly it or not. Certain costs are fixed. Such as the hanger, insurance, and some fees, like your annual. Other costs will vary with use, fuel, oil, etc.
You should ask yourself some questions. How often to you intend to fly? What type of flying will you do? Do you fly alone, or with other people? What plane fits that mission?
If you intend to fly alone, or with one other person; then two seats may be enough. If you spend most of your flights within X-nms from the airport, then speed may not be an issue. You get the drift on the questions.
For instance, my mission has shifted slightly. I want a plane with a few more capabilities in IFR. So I have to consider whether I need to modify my 150 or look for another plane. Upgrade costs can be estimated, but are they worth it?
I hope this helps.
