I did the same research last year and came to the same conclusion. However, in my case, the location of my server just did not have the bandwidth for me to use BigBlueButton.
Since my needs were usually just to talk with one student at a time, I downloaded and tried the Skype addon available here https://moodle.org/plugins/view.php?plugin=mod_skype. Even though it is listed for Moodle 2.2, I tried it anyway on my dev site. It does generate a few warnings, but worked anyway.
I tried sending a message to the maintainer back in July 2014, but he hasn't logged into Moodle since a month before that. The warnings were simple enough that I was able to fix them myself and have them on github at https://github.com/drachels/moodle_skype_activity if anyone wants to try it out.
The Moodle Skype addon is basically just a "phonebook" in Moodle and when you use it, it starts the normal Skype program.