I would think about a blade system for this particular application.
aren't blades still a significant premium?
(Say) one of the Supermicro blade enclosures. You could start small for
development with one or two blades,
well, nothing beats the incremental expandability of a stack of
separate boxes. given that modern cpus are drastically cooler
(esp per flop) than even 2 years ago, fans rarely run fast.
then expand. Should be easy enough to transport to the hosting location when
you are ready.
a blade chassis usually requires power other than the usual 15A circuit;
nothing custom of course (L6-30 is my favorite) but something like a
dual-board supermicro 1U is pretty convenient and flexible.
You can get acoustically quiet racks to put them in if it is going in an
office, but that will inevitably cost more.
if office, I'd certainly just get minitowers. but I wouldn't consider
putting more than a few in an office, since a ~250W minitower already
corresponds to the power dissipation of two people...
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