You can fly US reg airplanes anywhere so maybe you'll find your ideal airplane in the US.
Planes tend to be cheaper in the US than in Canada from my own searches for my first airplane a couple of years back - think some hangover from the pre C$/US$ par situation.
It would certainly mean no issues with "importing " it to the US.
No issues with exporting either - just fly it to where you're posted in the US.
The only 'catch' is that if you're not a US citizen you can't register the airplane in your name - you use a not citizen trust (a hint use one of the trust companies in the UK they are less than a quarter of the best price I got quoted from US companies).
You will also have the benefit of a US airplane in the US and if you decide to upgrade you'll have no problem selling.
That's how I did it with my PA28 - very simple with one other minor wrinkle - there is a little sticker you need to get each year to fly in to the US (less than $30) it makes thing easier when you enter the US - I needed one when I flew my plane down here from New Jersey - I stopped in Puerto Rico so need one as it is US - all went very smoothly except they confiscated my last apple (bought in Florida!)
If you are going to buy a low cost plane (your selection suggests in the US$17,000 - US$27,000 range) getting export CofA, registering in different countries, import duties and sales tax (yep, they make you pay that and they compound!) will be very expensive - if it's just "visiting" Canada you should not get those costs and of course none when it "goes back to the US".
This latter point was a surprise to me when I bought my plane down here - I was expecting duties and VAT of around US$35,000 on mine but not a cent paid - seems the airport here is in effect a giant "bond" so unless I taxi it out of the airport (or register it here) it remains in the bond and so no duties and taxes are due (I have always mused about an off airport landing!).