I have a Creative Inspire T7700 7.1 system with complementing Audigy 2ZS Platinum (7.1-capable) sound card. I love it for looks but once getting it I noticed it's slightly lacking in the midrange - music sounds ever so slightly muffled, like you're listening to it from speakers (rather than feeling like you're actually in the room with the singer). The sub isn't low enough to thump your chest but it's definitely more than adequate for my ears. Tweaking through the Creative sound card apps help the sound a lot - with the tweaks I love the speakers.
Friend of mine has a Yamaha home theater amp with 5.1 speaker set. I don't know the model, but it sounds absolutely stellar, just what I had been looking for. He uses the optical out on his G5 (can't remember if it's a separate sound card or included on the comp) to connect.
