So, what if I wanted just ONE H9? Can I buy the "standard" version and download the algorithms I purchased?
Yes, you can. All of the algorithms that you used to Max your H9 remain in your account, and if you buy a standard, you'll have them for your standard.
The question you asked was, "now I want TWO H9s again and have BOTH contain ALL the algorithms so what do I need to purchase". That was the question I answered. If you want ALL of the algorithms, you'll need to buy a Max again. If you'd be happy just with the algorithms you already purchased to Maxout the H9 you sold, then you could just buy an H9 Core or H9 Standard.