Second for Cafe Monarch.
Also a recommendation for Nobu, which although it's a chain, is fantastic. Last time we ate there in August, Trea Turner from the Phillies was sitting at the table next to us.
In retrospect I should've griped at him, since the Phillies lost 3 of 4 games vs the DBacks on that trip.
There's also a restaurant on the top of the Talking Stick Resort/Casino called Orange Sky, that's pretty solid, and has great sunset views. They have private enclosed tables in one area, but those go pretty quick, especially you'll be there during the high season (i.e. when the weather's better and all of the snowbirds and tourists return).