A little boring to me. Why not...
Seraphina/Serafine/etc. nn Sera?? So pretty!
And I've heard girls called Sarita, which also is more interesting. Saara, Sabrina nn Sara, Sarai, Sarava, Serena nn Sera, and Seren (which means "star") all sound better.
Christine is pretty, but again: there are a million running around. Christienne, Christiana, Kerstin, Kilikina, Cairistiona, Charys, Chiarina, Chrysanthe, Cressida, Kira, Kreine/Chreina, Kresimira, and Krysia all have infinitely more oomph.
Seren Cressida
Seraphina Charys
Sarita Christiana
Sarava Christienne
Plus a lot of other combos that are pretty..and unique.