Great article! I'm a musician and an audio engineer in my very little spare time so I tend to go overboard sometimes. (I use a condenser microphone into a mixing board so that I can EQ and apply effects to the mix before I go out to my recording tool.) One thing that I might add to this discussion is that you may want to record your audio to a little more high powered tool. Audacity is a great little freeware audio tool that can give you a ton of editing options that you just won't find in your audio tools packaged in eLearning programs.
That said, Storyline has one of the better voice over/audio tools that I've found. Results on playback sound quite similar to the audio that comes out of the mixer for me. Others I've used I'm quite shocked at the drop in audio quality from the mix to the eLearning development tool.