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I'm honestly not completely clear on what the different URLs are for - I'd just add a note to keep the core difference between canonical and 301s in mind. A canonical tag only impacts Google, and eventually, search results. A 301 impacts all visitors (and moves them to the other page). A lot of people get hung up on the SEO side, but the two methods are very different for end-users. As Tom said, if these variations have no user value, you could consolidate them altogether with 301s. I always hesitate to suggest it without in-depth knowledge of the site, though, because I've seen people run off and do something dangerous.

Thanks a ton.  I do have one last question, well for know.  I am not sure about the etiquette for Moz, so I don't know if I should ask it here.  But I will anyway, live and learn. Let's say I have a site with domain.com and a store on subdomain.domain.com We want to link the main\subdomain back and fourth.  Would this be a valid thing to do in the navigation since the point is to get the customer to the store?  Or, do the spiders view subdomains as separate entities? I would rather put the store under a directory but it is hosted by a third party. I have read the following but I don't know the validity, "Each subdomain is considered a separate site for SEO and rankings. But links to within site sub domains are considered as internal links by Google." I assume if that is true, I have nothing to worry about with concerns of nofollow on those links.