Hey Mahbit
Travelpunk.com!!!
Some things will be cheaper for you as you will splitting the cost, so that one bonus of treking with a few friends...Since the introduction of the Euro I am a little outta the loop when it comes to drinking costs in Ireland...On that note, if you buy some booze at a store and drink before you go out, then nurse the drinks you buy at the bar, along with hostel bed and food I think your going to be looking at about 75 - 80 E a day...No that can go WAY up if your parting every night, so you might wanna prepare for more...And don't forget to bring shirts that have colers and pants that are not jeans, alot of place clubs mostly will not let ya in...