Open Hardware Monitor - Core temp, fan speed and voltages in a free software gadget
This is what I use to get the temps etc.
It only gives the basic stuff you need but its just enough for me to be looking at when I need to.
I think sometimes there is to much data given by some of these apps and it takes to long to work out what on earth you are looking at. I have stuck with that because after starting you just see what your interested in and nothing else.