I use OCCT for testing / monitoring.....once I am dialed in, I kinda forget about it. The Asus BIOS options and Asus probe provide enough for any monitoring junkie but there's also Speedfan, coretemp, realtemp, hardwaremonitor, PCWizard, Everest, CPU-Z, GPU-Z and many, many more.
Coretemp works with the Logitech LCD keyboards and displays on the KB's LCD which is nice
I don't have an Asus motherboard, so that's out. Out of the remaining options, what would you recommend?