Michael,
I'm a newbie to this forum, but have been dealing with batteries for quite a few years. I bought the Batteries4Broadcast (nee GlobalMediaPro, from New Zealand) starter kit: two NP-1s and a two-bay charger. Actually, I ordered straight from the NZ OEM (though they're all made in China, even IDXs, but I digress...) which saved me about twenty bucks, once you factor the shipping, etc. Anyhow, they seem to be well put together, and I frankly doubt there are any serious differences between them and IDXs. I checked various reviews and feedback in other forums, and all other owners seem pretty satisfied - especially considering the savings.
I also have a PCS BDS, pretty common setup among mixers, from what I've seen.
HTH,
BK