Hmmmm, I still use the cheapo stereo Labtec Spin 50 speakers that came with this PC, via a bog standard Realtek AC97 integrated soundcard, and it's wonderful. They're only one watt RMS each, but that's more than enough for any game or music track, and they really are crystal clear.
I was once tempted to buy a set of (critically acclaimed) Logitech X-230 2.1 speakers, but they didn't sound right. Too 'boomy', and no amount of adjustment made them sound right. I managed to get a refund on them (nice one, Argos), and reverted to the old set-up.