Hi Denise,
A bit late to the party but at FeedOtter have a number of large publishing companies that send daily "editor-curated newsletters".
You would connect all your Wordpress ...
Interesting, I've never used Infusionsoft but heard recently they could have as many as 35K companies using their product. Active Campaign was a pretty good value for the money......
Bee free is the way to go... by far the best tool I've used. Pretty sure Knack uses the Bee editor but built a smooth Marketo integration to make life even better for us Marketo us...
We use FeedOtter to do this for us, the price is 1/3 of Digesto and it came with a nice library of newsletter templates which saved us some time building emails with the Marketo ed...