Ice, you can't go better in my opinion that call 13434.
All calls through them are ever so cheap especially to mobiles, not just landlines both here and abroad and once your landline rental is paid to Eircom, all calls prefixed through 13434 will be charged directly to the internet based account which you set up with them. ( And you can see in real time how much you spent on your last call within minutes!!!) I have both Blueface as well as Call 13434 and definitely can recommend the latter in your predicament.