hey pirred,
the xaser 3 case has the 2 80mm fans in the front which are decent at keeping the hdds cool, HOWEVER make sure you get rid of those cheap-assed crap thermaltake give. I replaced mine with zalman (cheap quiet and move quite a bit of air) and with a dremel i cut out the stamped grilles in fron of the fans - you dont need these since the black ones and the filters are more than enough.
That used to kepp all my drives very cool, and should be very cheap
other than that i would personally go for the coolermaster cooldrive (4/6) or the vantec nexus.