I can't help with specs, it's been to long since I researched building a machine.
On the subject of brand name computers:
Dell > HP > Gateway when it comes to installing new drivers, finding drivers and basically getting your geek buddies to help you upgrade or reinstall without having to call "Tech Support". The Dell machines just seem to have easy to identify and research model numbers. The others, not so much.
disclosure: I'm biased, I'm a Linux user and Dell has been really Linux friendly for awhile now. I don't own one and the above advice is targeted at a Windows user who might need a friendly geek to help with the machine in the future.
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