While you should ultimately choose the best option for you, I would strongly encourage the use of #3. Microsub readers are off to a great start, and I think the biggest barrier to entry is going to be servers. Aperture opening up will be a great step, but as you said, some people will want an easy way to have their feed data on their own server. A Wordpress plug-in that Added a Microsub Server to their Wordpress install would be a HUGE leap in lowering the bar for entry into using Microsub for ordinary people.