Well I played around with Radio last night, and am pretty impressed. Almost everything I mentioned here I have so far found in Radio 8. I created the Radio account, looked over the homepage interface, perused the preferences and configured remote FTP upstreaming to a non-UserLand server. Cool! A few posts and upstreams later and I was thoroughly impressed.
So it seems that I'll have all the features, power and control of running my own Frontier/Manila server but instead do it with Radio locally and render it to a remote host.
I'm aching to poke around some more with it, look into copying all THIS weblog data over to work with Radio, but my company has a release of its own coming up so we're squashing bugs this weekend in preparation.