I finally got tired of checking stock at the Apple store everyday just to be told they are out of 24" iMacs. SO I ordered a 24" from the Apple store. One of my main uses of the system will be for DVD playback so I would like to add a 5.1 speaker system to the iMac. 1. I have read the sound output on the back has several functions, one of which is optical out. Does this mean I would need to get a speaker system with a built in Dolby Digital decoder? 2. Which speaker system would have all of the following features: A. 5 speakers (2 front, 2 rear, 1 center) plus subwoofer B. Correct color scheme to match the new iMac C. Integrated Dolby Digital decoder D. Control unit which can reside on my desk near the iMac, I hate reaching down to the sub to access the volume and headphone jacks. Thanks for your suggestions!