THey're a little bit more expensive, but then they make sure you get decent components, which means you don't have to replace bits after a year or so.
Evesham.com
The e-style ones look so cool, but I've got this jobby
here, with a TFT screen. I've since added an audio card to it, to try and cure a problem with getting surround sound, but it turns out some graphics cards upset windows mediaplayer. Switching to PowerDVD sorted it. I wanted the all-in-one card so I could watch TV without clogging up my desk further, but I wouldn't recomend it if you don't need one - it's not terribly good...
PSD
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This is the work of an Italian narco-anarchic collective. Don't bother insulting them, they can't read English anyway.