pcgamergirl
Coffee Fiend
I have used TubeBuddy but I strongly prefer VidIQ. I still use the TubeBuddy plugin for some things (like the handy sidebar scroller on the right side when you're editing your videos, or a second keyword suggester just in case) but when it comes to keyword research or analytics or tag suggestions, I pay for the Boost version of VidIQ. It's pretty great.