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Most hardware is the same, so one system will not be significantly more secure than another. However, performance wise, the faster the better. Purchase the most powerful system you can afford with the following caveats or considerations.
1. Don't purchase the absolutely newest chip on the market, it is way overpriced, purchase one or two releases behind -- such as a 3.0 GHz instead of the 3.2 or 3.4.
2. Fully populate the motherboard with memory. Always purchase the fastest memory available and supported by the motherboard.
3. Buy the fastest and largest hard drives you can afford which are supported by the motherboard (or expansion drive controller).
4. Always buy 2 times the drives you need and set up RAID mirroring (do this in hardware if you can afford it, otherwise rely on Windows software to do it).
Always deploy at least 2 domain controllers so you will have a backup in the event of a primary system failure.
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