Audigy 2 vs. Audigy 2 ZS

[Halen5150]

I went into Circuit City this evening to purchase an Audigy 2 ZS soundcard for my pc. When I got there, they had the Audigy 2 Platinum(not ZS platinum)clearanced for $97, and it was the last one on the shelf, so I bought it. The only differences that I could tell between the ZS and non ZS models are SNR(ZS model is 108dB, non ZS model is 106dB), and the ZS model supports 7.1 channel surround and the non ZS model supprts only 6.1 channels. Am I missing something? Are there more differences? Are the two cards pretty much the same thing? The one I bought has the wireless remote and internal drive bay.

 

Here's the one I bought:

Audigy 2 Platinum

 

And here's the ZS model that I was going to buy:

Audigy 2 ZS