apparently there are 2 different versions of the PS A/S 3... different speed ratings.
if this is for year-round vancouver use, i would say go for the A/S 3, although yeah, i have not driven on them yet - but i've heard they are the best A/S tire out there (curious to see how they are, because generally i hate A/S tires).
i LOVE the PSS. best street tire ever.
peter