The chips in Morelli's on Thomas Street are pretty good, their burgers and fish are ok too, but it's their chips that are worth it. It's hard for chips to maintain any crispiness on the outside after they've been sweating in a take away bag, but Morelli's is the closes I had it from.
Got caught up in the "you have to go to Burdock's" thing when I first moved here, and whilst they're good I found they were slightly inconsistent each time I went, especially with the chips. And yes I went the Christchurch one.
Anyone been to that chipper in Blessington? Crazy guy down there runs a half sweet shop/ half chipper. All he mainly does is chips, but will thrown on the odd sausage if you want it. Cooks the chips two or three times, long wait but seriously worth it. Was wrapping them in proper newspaper too when I went.