Mine normaly sits at 29-30.
under presure (Video or games) it will probably rise to 32-33.
However, this could be due to the intake fan situated in the front between the two HDDs...
If it was not there it might have been higher.....
Maybe try and do that if you are worried. Also, hd coolers are not very expensive and are really easy to fit...
By the way Big B - which will be hotter - SATA drive or IDE? Or should it make any difference?
Just had a quick look at Seagate and Fujitsu sites and in both places the recomended operational temps are 5-50C. They did however mention adequet cooling.....
Keep it (AC) cool!