Assuming your warranty in canada is the same as here (100,000 miles / 160,000 km) then you are on your own.
My headgaskets went at 100,000, and they replaced the egr cooler and egr valve at the same time.
I replaced my turbo at 125k (new turbo is around $1,000 US...pretty easy do it yourself project), and at 126k my egr cooler blew again, and I lost a couple of injectors, so I replaced all 8 ($350 ea).
I would talk to the diesel tech who did the work and ask about this truck. There are EGR cooler delete kits out there (not from Ford, though)...take a look at the Powerstroke Forums for more info.
Remember, some of these issues are items ALL diesels have (egr valve, injectors, turbo), but the others are just poor design. Hopefully the newer head gaskets solve that issue, but the EGR cooler is one I think about every road trip.
I still really like the truck (bought it new), and all 3 have their issues. The tranny is the best of the big 3 (even better than the almighty Allison, IMO).
Hope this helps...if you're getting a screaming deal, and are ok with dealing with fixing a couple of things, then I would say go for it.