I found a third case! I guess there is some upside to having too much stuff around... This case has a bit more room between the back of the tape drive and the power supply, so I can made a shroud/fan assembly to suck air through the drive as needed. You can see in the picture I also added a fan blowing air on the SAS card, I remember reading in an article on how to use LTO in Linux, the writer had an issue with his SAS card needing more air flow, so mine has it now. The PSU fan runs full speed all the time, so lots of case flow, I covered alot of the intakes, forcing the air in around the CPU, SAS, HDD, and through the tape drive. I -think- that will cool the drive enough, but I have backup plans if it's not the case.