I've seen multiple Marseilles, Trieste, Tunisia ones. I've never seen them not die in a fire shortly afterward, however.
I've also seen Vienna, Trieste, Tunisia; that one's usually pretty damn strong.
You don't have many options. Trieste must be one of them, the second must be Tunisia or Greece, so that leaves you Marseilles, Munich, or another Austrian-sphere center. Your best bet is probably either a Western center, Tunisia, and Trieste with Austrian permission (say to get the double-fleet build, though of course you shouldn't let on to Austria that you expect to get that third one), or Trieste, Tunisia and an Austrian one as a full-on assault against Austria with Russian/Turkish help.