If people are not very adventurous Jacob's Cottage on Ormonde Street, Langtons or Dining Room in Newpark Hotel. For the more adventurous you have ZUNI as mentioned above, also Fleva, Renachinni's and Lemongrass, Green Chilli, Lautrecs is always a favourite also the Thai Restaurant in the Lyrath Estate is very reasonable and very tasty (we have'nt been to the other ones in that hotel as mentioned above).
I would give Pordillo's a skip as you have to have a minimum spend and not a great number of choices on the menu. (I just think a minimum spend is a bit cheeky as most people would go well over the amount anyway if you include a bottle of wine etc)