i'm pretty sure everest shows the temps... i've seen mine before but i cant remember the program
on a more helpful note....
i would use the big one, try and set up some air flow that will go thru the larger slots. try and set it up so that the wide slots are verticle and the airflow goes up (relative to gravity) this will encourage maximum natural (fanless) convection. the faster you can get air to move vertically through the grooves the better.