Looking for something lighter but tough enough to bounce off the odd rock if need be.
Souris River has a reputation for building light and tough with epoxy resin, with the ribbed hull design said to provide the right combination of flexibility and stiffness for increased resistance to rocks. I have an old ribbed fiberglass canoe and would agree that the design feature makes for a fairly tough hull that absorbs impacts better because of the flexibility. There are SR canoes for rent and sale at White Squall near Parry Sound and you'll be able to test-paddle there.
Canoes built with epoxy are also said to be longer-lasting and repairs made with epoxy and glass may be more reliable with less chance of delamination occurring with time. If were to lay out the $$$ for a quality canoe such as an SR, I'd want it to last 30-40 years if stored under a roof out of the elements. I wouldn't buy top-quality if the storage was going to be in the sun every day, under snow loads, etc.
Anyway, another option. The spectra canoes are also said to be very durable but not as light as the SRs. The amount of portaging you have to do could influence how light things need to be.... good luck.