the colored ones are the analog ones, the ones i'd honestly recommend. i have the old Logitech 5.1 speakers (Z-640) and i use the analog connectors and my DVD and game 5.1 is splendid 
unless you are a serious audiophile, there is no difference between analog and digital--it's stil gonna be DTS or DD encoded. PLUS with analog you can have your games (doom3...hl2...halo...millions of others) in 5.1 sound. with digital outs, ONLY DD/DTS can be 5.1, everything else is 2 channel (as Kane already pointed out.)SkyeHack said:really, there is nothing wrong with analog? isn't digital suppose to be a little better or something or is there no real difference to justify it?