I thought jigglypuff/Chris Bautista's remixes were all fantastic... I think his stuff did the best job of using the underwater sound of most fanmade vocal tracks as an advantage. It's all really polished stuff.
DJ Amaya's stuff has always been top-notch but his remix of Dream ON is the stuff of legend. It really brought out the song's melody and gave it a more full, complete sound. His remix of that song gives me feels, haha