It depends on what meal of the day and what sort of dining you like. I would make a Priority Seating ASAP wherever you choose. A GREAT middle of the road choice would be Cafe Orleans, not too pricey and they serve the famous Monte Cristo Sandwich.
If you want a special dinner, go to Napa Rose or Steakhouse 55, but they're very pricey.
If you need suggestions check out the huge thread, My
Disneyland Dining Trip Report, There are pictures of almost everything to be found at DL in there from snacks to gourmet.