What is the good combinaton?
This would depend greatly on your patient. Personally, I don't use/rely on auricular points for depression. For our protocols you could start by reading our Chinese Medicine treatment of Depression section.
Auricular points that can be helpful would be:
Ht7 is the best point to kill depression, some people wear tight bracelet also helpful.
I find this combination useful for depression:
If there is Chi stagnation I would add Liver 3 San Jiao 6.