Get some delta's, the old finger cutters lol I have always gone for noctua's in all my gaming rigs over the years when water cooling when budget has allowed. Really as a noob to the nas/server world i would grab a rack unit and delta's and stick the thing in the garage if heat was that much of an issue. Since the temp's in my home never go above 28 cel, it just seems silly to have over kill when cooling off a few 5400 and 7200 hdd's. If i was using raptors or scsi's 10k+ then i would built a case or buy one for which was a push and pull case flow with the hdd's center for the best solution and lowest noise. I have being oc'n since the p1 era days and when it comes to air its all about case flow no matter what fans your sticking in the thing. One of the sexist cases i seen was a table with a glass top and the user had his whole system in a push and pull format for air flow, it was pure geek porn lol.
I would really love to see some write ups on temps versus mechinical hdds degradation, its kinda common sense to not let them run hot but how does temp really effect there life span?
A+ on the guide