Just look for the best rated on the winamp plugin site. There the masses vote and poor little packs like mine get ignored.
There could be different categories though. (best newbie, best remix, most painfull to watch, etc.)
Meh. Best is subjective. I liked all the ones I put in my pack. Other's were sometimes fantastic and astounding, but I didn't like them. The hard part would be finding a pannel of judges to wade through all the presets out there.