bipartitis is a great choice. Keep that one!
For a 120, you can go with a healthy combo of sand sleepers and fairies/flashers. Pink streaks may become lost in a tank like that, especially if the fairies are on the aggressive side.
I'd also have a black leopard, yellow tail tamarin or red tail tamarin to complement the blue star leopard. I'd go black leopard + twistii tamarin, though
Lots of great Halichoeres, but H. iridis would be top of my list. Maybe a babi too. And a yellow pig.
For fairies, check the wrasseguy fairy mixing chart that is spattered across these pages. If I had a 120, naokoae, rhomboid, lubbocki, brunneus, and bathyphilus would be on the list (assuming jordani still isn't available). Maybe an exquisitus (Fiji) and a fine spot. Possibly a labouti. Lots of choices! Why not an earlei while we're at it!
I like carpenteri, but some here might suggest going for gold with an attenuatus or a hemi!