Discord seems like its better than skype in almost every way. Apparently the CPU usage is a lot lower than skype, better ping, can change the volume of individual people, etc.
Thanks for posting this, going to try this out soon as I can. I use skype a lot for playing cs/league/tf2 with friends and shit so this should be really nice to tryout. Not to mention my computer can barely handle having skype in the background so hopefully this will help a lot.