Murphys and Cafferys are a lighter stout, but I hear good things. Foxs is a must, there is also Petersons opposite Trinity College, really your tad/pad zone is from trinity up to Stephens Green!
I suggest you take your purchase to either Stephens Green or the Rose Garden in Trinity to test it! Also if your a coffee drinker Insomnia is a good stop to get a coffee to go before you find the perfect spot to sit!
The roof terrace in the Hairy Lemon is highly recommended. And pop into to Capt Americas if your a burger/cocktail fan! If you have a weakness for chocolate go to Penny's and try chocolate soup. After that just enjoy the city!