I vote for California Grill. That is where we will dine our last evening in the World this trip. It's a wonderful meal, and seeing Wishes from the balcony just makes it that much more Magical.
That said, I have also heard good things about Narcoosee's (from my in-laws) and DSis and her husband love Artist Point and Jiko. We are planning to dine at Artist Point during our upcoming trip.
My children love Brown Derby...we usually go there for the Fantasmic dining package...but our last time, the adults were disappointed. The first time I went there, I liked it a lot. However, I would not put the restaurant in the same class as California Grill. If I had to pick just one splurge restaurant, Brown Derby would not be it.
Oh, and don't splurge on CRT...at least don't go there for the food. The food is terrible.