I am kind of thinking of getting a new audio card for my pc, as at the moment my speakers are plugged into an audio thingamajig (you can tell I am a techno-whizz with these things

) that is connected to my mobo. I am using a pair of stereo speakers with a bass speaker, and have a Buttkicker plugged in as well. Would I really notice any difference with an audio card? Can anyone recommend something reasonable?