Thank you so much for initiating this discussion, and for sharing your system criteria. In 2011, when I was chair of the Georgia Section, I attended the Local Section Leaders Webinar, in which I learned that ACS is
promoting the Webs service (Webs) http://www.webs.com/for use by local sections, and that more than 110 of the local sections are already using this service. I'm not sure whether this is the service you're referring to in your item 2. ACS-coordinated web hosting.
Since every local section is faced with the issue of selecting the best system for its website, it seems like the Local Section Activities Committees should initiate a project to compare the functionalities of major web hosting services and systems, and to draft a generic set of requirements, so that local sections could leverage this information as a starting point, rather than every section having to start from scratch. This could be done under contract with an outside company, or possibly in conjunction with ACS's own IT staff.