Hi all, I'm in the process of saving for a 15" PB, which I plan to purchase some time this year (trying to hold out for G5s, but I may fail!) I'm in the process of looking at options for sound output to my speaker system. I've got a fairly decent Harman/Kardon AV unit, which I use at the moment with my PC (I use a coaxial digital connection) for DVDs, iTunes etc. I know that the G5 PM has digital audio out, so obviously I'm crossing my fingers (but not holding my breath) that the G5 PB may have it. Realising that is fairly unlikely, I'm looking at alternatives... My understanding is that USB isn't quick enough to provide a perfect 5.1 datastream, is this correct? If so, I presume I'll have to look for Firewire solutions? I've seen a few Firewire devices that offer digital audio pass-through, but they have a million other features I wouldn't ever need (and am not willing to pay for). All I really want is either optical or coaxial digital out (supporting 5.1), and maybe a digital input of either type, too. Does anyone know of anything on the market (in the sub-£150/$300 price range)? I've searched around a fair bit, but couldn't come up with too much. Thanks a lot in advance!