I'm currently a PC user with Logitech z-5300e analogue 5.1 speakers. I'm gonna be buying a Mac Pro at the end of the year and I might be getting new speakers too. I'm aware that I'll need something like the Griffin Firewave if I want to use my analogue speakers for 5.1. I'm thinking of buying Logitech z-5500d digital 5.1 speakers (heaps better speakers) , which I'm guessing I'll connect using optical. Although, I read on another forum that this wouldn't give me surround sound for everything (i.e. iTunes). What I'd like to know is if there's a way of using the z-5500d's for surround sound for EVERYTHING (including movies, music...) or if i'm better off sticking with my analogue speakers and getting the Firewave. Thanks guys.