Buying a new PC, help plzx

[Angrist]

So my PC is almost 5 years old and it's starting to get really unreliable. Also, I can't play all the games I want.

I'm getting a PC where I can kick out or add additional hard/software. For example, I don't want Windows Vista. I want a good fan, a decent dolby surround soundcard, etc.

How is this one? http://www.paradigit.nl/configurator.php?system=2165

I'm not sure what the onboard soundcard is like. What's the difference between processors? Intel Core 2 Duo E6550 2x2,33 GHz 4 MB vs Intel Core2Quad Q6600 4x2,40 GHz 8M Box.

Thanks.