Hey guys.. First my current setup, late 2009 iMac, Mackie MR5's monitor speakers, Mackie 402-VLZ3 mixer. Like many others have experienced, I get a really bad hissing sound with my setup (or any setup for that matter), and it gets noticeably worse when I'm scrolling through pages. I am coming directly out of the headphone jack, into my mixer. I've searched these forums, and I've noticed that the general consensus is to get the Mbox USB interface. Looking at that though, it seems as if people get that for digital recording, wanting portable recoding studio, etc. I was told to get a USB audio interface. My only reason to get one is to basically eliminate the hiss, because I plug whatever I need to use directly into my Mackie Mixer anyways. Is there a good quality, pretty basic USB interface out there without all the bells and whistles? I've noticed the cheap China crap on eBay, but I am assuming that's garbage. Any recommendations? Thanks in advance.