ac, fan enabled high airflow, or a combination of both? don't forget these chips respond to cool air by self oc'ing which is what i want.
i've priced out the specs doing it by ac alone and it is expensive. the amount of kW of heat is enormous on calculation. there's gotta be an easier way. i live in an inclement area with pretty standard 72 degrees most of the year with some heat during summer.
the good news is there's roof right above the ceiling and a sliding glass door out to a balcony for some flexibility.
since the life of the systems doesn't have to be that long, you may not have to worry that much about humidity so give some thought to using large amounts of ambient air as an intake and exhaust the hot air out the roof. if you can get enough airflow from the outside... you may only need the a/c to supplement the cooling in the warmer months...
and the life of these systems will start in the middle of winter, and by the time the height of summer rolls around in 8-9 months, their value may not be so much that you wouldn't consider selling them and buying the next generation gear anyway...
-- Jez
that's the way i'm intuitively leaning as well.