Why do you want to change any of them ? Do you have any problems with your current setup ? Because upgrading the CPU won't give you a noticeable boost in performance.
And changing the motherboard isn't worth it either,unless you need CrossFire.
what is motivating you for the upgrade?? Is it that you want SLI/Croosfire?? becuase the ASUS M4A77TD does not support as many PCIE slots? is it that the ASUS M4A77TD also doesn't have as high memory (1800 vs 2000*OC*) vs the Asus formula?