The Titan, truthfully, doesn't excite me that much. Don't get me wrong, they did a really good job on the model, from the look of it, but I'm not really a fan of the design of the ship itself. I just don't think the long oval saucer of the Sovereign lends itself to a "Nebula" configuration the way the wide oval saucer of the Galaxy did.
The ones coming up I'm looking forward to, are the Daedalus, the D5, and the Jenolen, plus probably the BoP in attack configuration. (I'll probably pick up the Kyushu and the Rhode Island too, when they come to my area, if I get the chance).
Beyond that, I'm sill hoping for a few more off the wishlist I posted on Facebook a few days ago (in no particular order): Degra's ship, the 23rd century Tholian ship (from remastered TOS), the Lakul, the Merchantman, the Groumall, the Jem'Hadar battleship, the Xhosa, and the Bajoran starship (not to be confused with the one coming up).