Matt – (Also in Canada…)
I've got a Sievert, purchased a few decades ago now. I've also got an air/acetelyne torch, "prestolite" sounds like the makers' name. It's used in refrigeration, etc. Yes, both were expensive, but, they "just work" without hassle, so (to me) were worth the price.
The Prestolite torch is pinpoint focused heat, has burners where the air goes down the tube from the handle, and screams like a banshee. Got it from the local welding place.
The Sievert torch, the burners I have are NOT the "air goes down tube" type, so if I stick the burner anywhere inside a compartment (firebox stay soldering…) it tends to go out. Something to watch out for.
If you are looking for straight "oomph", look at what people do for burning weeds out – Princess Auto used to sell big torches, with long handles, for burning weeds. Maybe Lee Valley, too.
As others have mentioned, the connectors to tanks may be difficult. The Sievert regulator I have does have the left hand thread that screws into the inside threads of our propane (Bbq) tanks.
Maybe also look on kijiji.ca – and ask local model engineers, and see what's available in your area.