Why not look into an post savings certificates, after three years you get 8% interest and it's DIRT free. Have a look on the website www.anpost.ie and click on the personal customers tab
An Post rates are pretty poor these days even if they are fixed, state guaranteed and tax free. 8% over 3 years is a mere 2.6% CAR or the equivalent of 3.25% gross CAR on an account subject to DIRT. Check out the best buys forum linked by CCOVICH above for much better deposit rates.