Nice, newly restored, desktop PC
... powered speakers, keyboard and mouse included.

Gateway 830GM - $150.00

XP Professional Media Center Edition - SP-3
Clean install of XP.

Pentium 4 - 3.00 GHz - Dual Core
1GB of RAM

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See 4 monitors choices here, is you also need a monitor.
http://www.sightsea.com/pc/monitors.html