You haven't a list of the costs of each piece of hardware. No list of guarrantee of each part, either.
As you seem to be quite knowlegable, possibly it would be worth visiting a site that would build a system for your own specific use with a three year warranty for parts and labour? Also without an OS if you have your own.
Use google for various builders as the only one I know with a high reputation on these boards are Cougar Extreme.