What's the best computer with these parameters?

Question by Ryan J: What's the best computer with these parameters?
What kind of computers are available that aren't proprietary (I don't want no Dell, Gateway, E-Machines, or other proprietary computer product family), is a regular size rather than slimline (because I hate having to connect smaller plates onto PCI cards to make it fit, and hate having to make sure that devices I'm about to get are slimline too), has Windows 7, has a processor with between 4.7GHz and 5.2GHz, has between 4BG

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