Josh, for a number of years I have been building spinnerbaits from components and using Spro-Gamakatsu snap swivels, size 0.
http://www.barlowstackle.com/SPRO-SW-Gamakatasu-Ball-Bearing-swivel-with-Interlock-Snap-P878C123.aspx
If you don't care to assemble your own, you can open the loop on a spinnerbait of your choice and replace the standard 2 split ring swivel with the Spro-Gamakatsu. Be sure to close the loop so there is no gap.
One disadvantage to a snap swivel is that if you're fishing a weedy environment it will foul more than a 2 ring swivel. It works fine for me because most often I burn a spinnerbait close to the surface but sometimes slow roll over rocks with sparse weed cover.