I have heard very good things about the Dublin Flying Club. Runs out of Dublin Airport - which may sound too busy but ATC there like to clear the clubs a/c for the very quite 11/29 runway (1300m) and not the main 10/28 (2600m) which just about everything else does go off.
From my contacts info, club prices were good and experience excellent. I´m told its run on a no profit basis, instructors are Aer Lingus + Aer Arann pilots just doing it for fun. Contact details are listed in:
www.irishaviation.net/flyclubs.htm