For the CPU temp it really doesnt matter, So long as it doesnt crash under a heavy workload on a hot day.
Below 60 C is nice, however there is alot of variation in methods of temp measurement, and many of the software programs ain't too reliable either.
Case temps in my opinion should not be beyond 10 to 15C above whatever the room temp is.
The idea behind this is that you dont want your hard drives getting excessivly hot, particularly during summer. As heat can possibly shorten drive life/ cauze data corruption.
<b><font color=red>He who bargains with a dragon is either a fool or a corpse.</font color=red></b>