I don't think you could wrong with anything on their menu. But remember the selection changes around, so something suggested on here now might not be there when you go.
My absolute favorite thing I've ever had at Cali Grill is the Risotto with Goat Cheese and Meyer Lemon Beurre Blanc. I've had it 2 ways - with Lobster and with Shrimp. I preferred the Shrimp, but I'm not big on Lobster.
One time I had an out of this world Curried Cauliflower soup. Haven't seen it on the menu ever again though.
The Ostrich Filet entree is excellent. I've seen it with 2 different preparations, but only tried one.
I'm not a pork fan, but most of the people I've been with are huge fans of the Pork Tenderloin, which is one of their signature dishes. I've never not seen it on the menu.
All of their desserts look amazing, but I keep going back to the Valrhona Molten Chocolate Cake. They pair it with something seasonal. I've had it with raspberry ice cream and sauce, and strawberry ice cream and sauce, and most recently, with peppermint ice cream and macerated cherries.
I once had a Chocolate Souffle dessert that was amazing, but I haven't seen it on the menu again yet.