I ordered this:
Charger:
iPower charger
520 mAh 8.4V
230 mAh 9.6V - Out of stock, but they will send it when they get it in with no additional shipping fees. I guess I will take my chances!
Pro-sound seems to have great service!
I also ordered this, which says it requires the specified charger. They show the specs and from what I can tell, the iPower charger will work with it.
600 mAh 7.4V
Oh, and the Stepdance has absolutely fantastic control of the bass region of the spectrum, which cleans up everything else. Use with cheap dynamic driver IEMs/earbuds makes them sound like they should cost waaaaay more!