i have these speakers, i paid around £100 18 months ago and they're very good. i listen to a wide variety of music though mostly prog house etc and they sound great, surprisingly good bass and look the part too!
I suppose they'l do. Can't think of much else for the price, but would recommend teh aego 2.1 system for a bit more. Will be far superior, mainly because of the sub rather than 2 pokey speakers with little drivers.
I've got the Z-10s, very nice speakers and they keep their quality well even at very loud volumes. Had them a couple of years now and aside from the Creative GigaWorks sets, there's nothing else I'd really want. The LCD seems a bit of a gimmick and...well, it somewhat is, but it's quite useful too and the media controls are quite convenient if you listen to music with your monitor turned off.
They've got a standard 3.5mm input too, so if you don't/can't use USB you've got that option as well.