My search for an all-in-one cart/membership/affiliate solution continues... but these are names that I see coming up a lot now in relation to services that can do everything in one place. I am hoping that the creators and users can help me out here with some questions.

One of the main things I want to do is have paid members have discounts in the store, which will contain digital items (large videos) and physical items that can be purchased by both paid members and non-members.

Option for secure streaming video is a big plus, although that would probably not be until later on.

Nanacast sounds like it can do just about everything, but I couldn't find if integrated discounts were a part of it. There's also their Terms of Service, which forbids adult, and one of my sites has some content that may fall into that category (not XXX but maybe R-rated).

PremiumWebCart sounds promising, but I keep seeing people bring up Wishlist Member with it. I'd rather have one service do it all, since when you combine things you end up with hidden costs, I find. If those are the only two things that need to be bought though, then so be it. I just don't want to spend a ton of money then find out I need to buy EVEN MORE things to prevent password sharing, and things of that nature.
*edit* looking at their ticket/question website, they're out. 50MB limit on filesize. Ouch.

Infusion/InfusionWP I've only begun to research, so any details there are much appreciated.