z5400...gd luck...it wont sound good to me...i really hate the sub(as the z5300)...do tell us how it sound...
mainly music?dunno y u plan to get a z5500(5.1) for music...anyway,diff ppl hav different preferences...mayb u're bass lover,u'll love this speaker..but dun blast it too loud,satelite burst insurance wont cover...
ur soundcard its enough for z5500...later when u planned to upgrade ur speaker(mayb its a downgrade 5.1 -> 2.1 or bookshelf) to audiophile grades den only u'll need better n warmer soundcards or amp...bcoz music as its jz stereo,no such thing as surround(unless u're listening to DVD-audio),the surround u heard is processed from ur soundcard which is not the original source from the cd...
gd luck n enjoy ur new system

saw u got the aego M...same as me...we got same systems...but in diff sequence...
i got the z5500 1st then oni aego M,u're opposite..
i'm going to try to pair them...booomy+bright,hope the sound is nice in this combo

z5500 is good for gaming n movies(especially DTS)
when comes to music...

too booomy for me...
im stil using my aego. This 5500 really sound terrible for music. Bought this cause wanna get the best out of my xbox. So now the aego is in my bro's room.. replacing his atp3. everytime want music.. ill go to his room.. hehe