So here's the deal.  I'm looking to buy a 5.1 setup. The MAIN reason I want this is for movies, and to play music from my PC, and my guitar. I want to be able to play music from my PC AND guitar at the same time (like back tracking). Now I have an M-Audio Fast Track. It has two outputs...

Good deal, thanks! Placed the order.

So I've done the research and now I'm looking to buy.  However there are a couple different looking designs of the same model floating around.  I was wondering if there were any difference between the two?  I want to purchase from the 2nd link because they have a 45 day satisfaction guarantee...