Habu,
I suggest you have a complete pre-buy inspection done by a shop and or a mechanic who is experienced with the aircraft type.
Every aircraft has areas and issues that might not be apparent to someone who hasn't had experience with it. Get a written evaluation from them at the completion of the inspection.
Have a title search done by a professional search firm.
Consider a brief chat with a representative of the Canadien equivalent of the US FAA to make sure all registration and certification issues are clear to you and you can verify it is legal to operate.
Learn about any recent or reoccuring AD notes to the airframe, engines, props and accessories. Your shop should be able to help you with that. These can make very expensive surprises if you dont do your homework.
Corrosion is always a concern, and an aircraft can become economically unrepairable faster than you can believe if corrosion is not detected early and properly removed/treated.
Check on hangar, insurance and projected maintenance costs prior to purchase to know what you can expect the annual expenditure to be.
If you are purchasing with the thought of taking it to airshows, I might recommend checking with a few airshow organizers to verify that they would be interested in having your aircraft appear enough to cover costs. Many may just offer you fuel.
Good luck if you choose to buy it, I think it would be a blast to fly, and you could have many good times with it. Just do your homework well first to avoid any surprises. Many have learned that lesson the very hard way.
BTW, never trust an airline pilot. There are good ones, but there are those who's ego is only surpassed by their greed.

dago