I am from (and still live) in BC. How'd you get to the "good" T.O? My dream is to not have to wear a 5mm wetsuit to surf! We spend a ton of time between SLO and Ventura and would kill (not really kill), to be able to live there full time!
I would stay away from the duramax, it's a good drivetrain, but from what I hear they tend to go through injectors with some degree of regularity and it's not a cheap job to replace them.
I love the 7.3 powerstrokes, but I'm not really too up to speed on the newer ford diesels, so I don't have much to add there.
I would second what many others have said here, if I were buying a diesel truck today it would have to be a Dodge with the cummins. I'm not a big fan of Dodge products in general having had some less than stellar experiences with some in the past, but the cummins would allow me to overlook that without hesitation.