As a casual electro musician, I tested various DAW and all I can say is that it depends first on your needs. All the DAW are capable to do anything, but some times they can do anything except the very little special thing you were expecting it to do. Also, some times you could be looking for "a way to do it", I mean how complicated it could be to do the actions you want to do.
From my experience, for eLearning use, I would check first Audacity. Yes, the ol'good OpenSource software...
I also use another software : Ableton Live 8 Lite (an exceptionnal giveaway) and when I wanted to record with it, even if I already know how to use it properly, I got bugs on tracks that I did not have on Audacity. o.0
Don't go too fast with buying a software licence. Try Audacity first.
Many softwares out there are proposing a pletory of features which you would not use or even understand (I know it). Audacity is easier to use. Now, I only use it for recording and Ableton for sequencing and post-prod works (fade-in and out, filtering for phone effects, mixing with field captures...). Audacity is a rock solid piece of audio software.
I heard Reaper is a good one too, but I never tried it.