LaCie's Sound2 PC speakers look good! Although I don't know where it sounds good or not. But if you have such a sexy designed speak with your mac. It must be a cool thing !
It can boast 30 total watts of peak power and it only require you one free USB port or Line in for input. It can connect to your Mac, PC, iPod or iPhone. And it will get its power supply via the USB port to you Mac or independent power supply.
How much it cost ?? It only costs you US100 !