Im looking for some suggestions on new fish that I can buy myself for christmas

In my 120(4x2x2), I keep mainly SPS corals, a bit of LPS, currently no zoo's or softies in the display.

My current fish are as follows:
Blue Throat Trigger
Tennenti (leiutenant) Tang
Potter's Angel
Royal Gramma
Algae Blenny
big fat Mandarin dragonet
6-line wrasse
two regular firefish


I have no agression in the tank currently and I'd like to keep it to a minimum. I don't want damsels/chromis, I just sold off a pair of occelaris clownfish as they were getting agressive, so Im not so sure where to go.

I have been considering a group of chalk bass (5 or so), possibly a pair of Bangai cardinals, or 3-5 pajama cardinals..

Give me some ideas!