As per ikeane, paul Nolan in Artane is your man - he's worth travelling across the city for. He's worked on plenty of FTOs over the years and comes highly recommended by a lot of owners. His no is 0862649884, tell him where you got his details
Does it really matter what garage services the car anyway?
Assuming you want work done to a high standard, don't bring your FTO to any old garage, that goes for any car IMO.
In terms of rust, bodywork etc, any local panel beater should be able to help you out, theres a few southsiders knocking around the place who can point you in the right direction
CJ