The SB Live Platinum is a waste of money, I had a 5.1 platinum and the live drive was of no use to me. I find the Game Theater box to be a lot more useful, especially the USB jacks.
In the past four months I have owned a SB Live Value, SB Live 5.1 Platinum, Santa Cruz, Acoustic Edge, and now a Game Theater. The Santa Cruz and Game Theater are my two favorites out of those five. The Game Theater is awesome, volume and sound quality of my Klipsch Promedias is unreal with this soundcard.