I've never bought them on eBay, but EBC and SBS pads have worked well for me. Sintered pads..
I'm pretty sure this is what's currently in my bike. http://www.ebcbrakes.com/motorcycle_...ds/index.shtml
I'll be changing tires soon and will inspect pads at that time.
I've used these, also.. http://www.sbs.dk/index.dsp?area=173