I’m only at the beginning of this but want to use subscribe2 on a dreamhost hosted wordpress site. From what I’ve read, subscribe2 has an upgrade option (for a fee) to provide the full HTML look you seem to be asking for. Also, in its settings, you can choose once per day notifications and I see a Subscribe2 reference to digest postings (but I don’t know how to configure it).
What I don’t know anything about is the use of announce lists and how subscribe2 interacts with them. This is my goal.
I suspect this isn’t much help but perhaps we can get enough of a consensus on how to make this work.