Logitech has a ton of speakers to suit all sorts of needs. They have 2.0 speakers all the way to full surround sound systems. The thing that most surround sound speakers systems for computers have in common is that they tend to be expensive.
Logitech has announced a new set of surround sound speakers called the Z506 that are very affordable with a MSRP of $99. The speakers can be connected to your computer, DVD players, game consoles and more. All of the cables needed for connecting the system to your PC are included.
The speakers have 75W RMS or power and the volume controls is on one of the front channel speakers. You can pre-order the speakers right now, though the shipping date is unknown. You can see the Z605 on video here.