If a good AMV has been made to a song before, I probably won’t want to edit with it.

I feel you on this. Oftentimes, I simply have an urge to see a particular song with visuals so before using a song I almost always search and see if there are any AMV's that already exist with it which I enjoy. If so, then a lot of the time I don't feel I need to edit with it myself as the desire has been fulfilled.

After 9 months of video editing, my list is up to 30 ideas

Oh wow, that's impressive! Never doubt you're fully fledged AMV editor, I swear we all have too many ideas.