As GetReal said, this is a very well constructed machine. Not
cheap in any sense. Very comparable, both in components, construction
and performance, to the competing HP Kayak XU800. To buy a comparable
quality case and power supply, if one were even available
commercially, would probably cost you $200-300 at discount.
Also, as GetReal correctly stated, Compaq uses proprietary motherboards.
So if you buy one of these, do not expect to upgrade the MB down
the line. You might be able to do it, but it wouldn't be pretty.
I have both the SP750 and the XU800, and I like the XU800 a bit
more because it's somewhat smaller, better looking on the outside,
and somewhat quieter. But the SP750 is nothing to sneeze at.
Kwad