It should be pointed out that these are active speakers with a builtin USB DAC. There are a variety of these things out there at this price range atm and they sound surprisingly good. Recommended.

Alternatives:

http://www.thomann.de/gb/alesis_m1_active_320_usb.htm

http://www.sweetwater.com/store/detail/StuDock3i/?adpos=1t1

(There's a decent chance all 3 are the same product rebranded tbh.)