Tcase = 37 (32 in BIOS upon restart) & 55 (up to 62 with TAT)
Tjunction = 32 & 50-55

well first of all you dont own a board and there is no baord in exsistance that shows Tcase and Tjunction as the way you are saying. so i am not sure why your calling it that.

tcase and tjunction are for the oober geek and dont mean squat for normal ocing.

personally dont look at the tcase and such of TAT,
and dont forget TAT doesnt show CPU temps, it reads the onboard Core probe that is built into all conroe chips. that is built directly intot he cpu itself so temps are always, ALWAYS higher than any other temp program reads, as other programs read the outer probe or probe thats built into the board itself.
which can be 10c or more lower than TAT.

and that arctic Freezer isnt the best cooler around, its not horrible but for me i place it in the range of the stock cooler, but only slightly higher.
so dont expect spectacular temps with it unless its sitting outside your case buy an open window with the cold winter air blowing in.