Just wanted to share outcome of my exhaustive search for a good managed hosting provider:
Ghost (Pro) is of course the big, official one and it helps sustain the project…but I found it pretty expensive if I wanted to have my blog on a subdirectory, more than 1k members, etc.
Firepress.org is by far the most comprehensive alternative I found. Offers pretty much all the functions of Ghost Pro for $19 per month. (including CDN).
Some other solutions I considered include Midnight ($15, no CDN) and the new Gloathosting.com. But their feature set is more limited at this time.