You could get hold of some temperature monitoring equipment- a bit like the Thermaltake Hardcano. I have one and it controls all of my fans plus it has thermo sensors (3) that I can put anywhere I like. It has alarm when things get a tad warm

The FastTrack has SMART built into it- i.e. it is capable of allowing the OS to read SMART info through the controller and off the hard disks.
As far as I can see the SATA150 doesn't support SMART.
I run 2 WD Raptors next to each other (they spin at 10000rpm) and they usually sit around 35c or so. Maybe if you are prone to lots of heat you could look at ventilation in general. Maybe a good case is in order, or maybe some more drive coolers?
S