Need advice on MemberPress vs MemberMouse

Hey everyone! I've been doing a crazy amount of research and I think I'm close to landing on a solution, but I'd love to hear some advice from people who have done this before.

I currently have a significant audience on YouTube and an active email list of many of them. I've only sold one product to them, a downloadable ebook, which did quite well. I sold it through my Wordpress site using Cart66 Cloud, which worked great.

However, now I'm planning to release a short training course each month that's about 45 minutes long total and split up among 6 or 7 lessons or so. Each course will be its own stand-alone product that I'd like to sell a la carte for a one-time fee, not as part of an on-going monthly membership fee.

Since Cart66 Cloud doesn't interact with the WordPress user database at all, I can't use it with the WPCourseware plugin and restrict access to the next lesson until the user passes the current lesson's quiz. Nor would the user be able to save their progress in the course if they stopped and came back to it later.

So I'm looking for a solution that does a couple things:

• Let's me use my existing WordPress site and theme
• Let's me sell ebook downloads with protected links
• Let's me sell multiple courses for a one-time fee each
• Let's users have a dashboard where they can access the courses they've "unlocked" on their account
• Gives me the flexibility to start a monthly paid membership site in the future
• Let's me continue to use my site primarily as a public blog
• Doesn't require me to hack together a ton of different plugins
• Supports DevAffiliate since I really don't want to have to ask my affiliates to change systems and update their links
• Bonus: Let's users leave a star rating and a public review for each course.
• Bonus: Let's users sample the course by taking the first lesson for free.

It seems like both MemberPress and MemberMouse could potentially work well for when I need, although I've seen a few people suggest Kajabi, too. (MemberPress doesn't publicly support iDevAffiliate, but I contacted them about it and they said they could help me make it work.)

Any advice you guys have for me would be great, especially in which tools to use to accomplish this. Thank you for your recommendations and suggestions!