Build needs review.

[RobinGBrown]

Only things I noticed are already mentioned:

Steel cases are HEAVY,you could try going for an aluminium one of you can find it within budget

Cooling will add quite a bit to your total cost and it's not worth skimping on

What about a mount for all those monitors? Or do you have one already?

[jstanthr]

check out the antec lanboy air case, it is a good air cooled case