I bought 4 identical Dell mini-towers - 2ghz Core Duo w/ 1GB RAM and integrated graphics - for $300 each including shipping. They're typically running at 30-60FPS depending on the situation. I'd estimate they draw about 150W each (the power supplies are only 250W max), and generate very little heat. So as far as cost/heat/electricity, it's not a problem if you're careful about what you buy.
As I see it (still not sure if I made the right decision myself), the main argument in favor of one beefy machine is the ease of setup & use. With keyclone, especially new features like PiP, one beefy machine has great advantages over having lots of monitors or using VNC.
The main disadvantage is that, even with four cores, four gigs of RAM and an 8800, I doubt your framerates will be as smooth as separate machines.
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