I finally purchased RocketPost ($37 US). My trial period had expired. It seems to be continually updated (and tested?) so I hope it was money well spent. It still has some rough edges like this:

... but it's getting better. Drag and drop image support seems to be a bit flaky now. When I dragged the image into the location above, it was inserted at the beginning of the post. (I had already typed "but it's..." portion). It now supports easy uploads of any files, which I'm sure I'll use.

It has poor-bloggers trackback support: