My favorite dining experiences, most of which are signatures:
1) Citricos - amazing food, amazing service. I would HIGHLY recommend for your birthday dinner. I've been three times and they made each visit like a special occasion.
2) Flying Fish - great food, and a great steak if you don't like fish! Very good service.
3) Jiko - amazing food, not overly impressed with the service but it wasn't bad.
4) bluezoo - excellent, really fresh fish, and wonderful service. Also very easy to get an ADR for (probably because they are not on the
DDP). Get the chef's tasting menu! It's five courses of yummy surprises!
5) California Grill - I list this at the bottom because the atmosphere isn't what you would call romantic or quiet. But I think the food is still great. Service can be spotty though. You will see more kids here than the other signatures.
6) Sanaa - LOVE this place! It's not considered fine dining, but I absolutely adore the place! Best non-signature restaurant IMO. Wonderful, interesting Indian-inspired food and great service, with one of the best views in Disney!