Originally Posted by TJ Max
Every review will tell you that the Z-5500 are highend for 5.1 PC speakers.
In addition I'm placing them in a very small 9x12 room, so larger speakers are'nt practical.
I'm sure they are as they're pretty expensive for computer speakers and should easily fill a room that size as you say. The best computer speakers I have ever heard are the Mission NXT flat panels which are also available in 5.1configurations and have the added benefit of being suitable for wall mounting which is convenient if space is at a premium. They have something of the quality of Quad Electrostatics. You may also want to check out these if you havn't already bought the Logitechs.
For music as opposed to films though unless you are really into surround sound discs then I think stereo speakers are still a more realistic listen, as the mastering of surround sound discs is often compromised by having to be processed from original stereo recordings.
In which case you might also consider compact active nearfield studio monitors. Genelec would be the benchmark but cheaper ones from Yamaha and JBL can also be very good. A pro-audio shop would be the place to listen to these. Subs are also available for many of these but in a room the size you mention would be largely unnecessary.