i do agree with a speaker set up being the most important factor in how something sounds... but just like with gaming, your fps performance is usually determined by your weakest component (that example doesnt exactly work i guess, cuz most games performance are determined usually by the graphical demand you place on the gpu)... im sure you know what im saying though, 'a chain is only as strong as its weakest link', if you have a great speaker set up, but a horrible sound card/low quality media file or such... youre almost guaranteed to be able to pick out flaws in the source sound... and vice versa, if your sources sound is great, but your speakers are less than you would want... the sound card (or the media your playing), wont have nearly enough justice done to them, and be more of a waste qualitywise, cuz your speakers cant adequately perform... speakers are the most important part, no doubt there... but with having good speakers, doesnt mean having a decent or great sound card should go neglected (unless youre happy with the sound card you have, and the overall quality of sound thats output from your speakers, then no problems)... ...as far as 'background noise' though, some people dont have the problem at all (for instance: using a strictly digital interface between the sound card and the digital signal decoder certainly helps with that problem though)... but, if/when the problem does occur, it really can be a bother.
also, in regards to comparing audigys to most current integrated sound solutions... i agree that there really isnt much audible difference between the two in comparing sound quality... the main advantage audigys have, is to reduce cpu usage during gameplay (and they are really about the only cards that can use versions of EAX above 2.0, for licensing reasons, making that just proprietary, and locking you into purchasing their cards, if you really feel you want EAX support, but its by no means required for any game to work, at least that ive seen anyhow, could be wrong though... theres also the x-fi that can use higher versions of EAX too, but yeah, same company again)... but with cpus being as fast as they are now, now with dual cores being widely and readily available, and multiple cores on the horizon (and games being coded, and patched, with multithreading in mind), the point of low cpu usage, almost becomes moot... thats about the only practical difference between the two though, IMO.