There are several schools training to PPL level in Ireland. In Weston you have Eirecopter, EHA, Premier to name a few, In Cork (and possibly Waterford) Bluestar, Executive in Galway. There is only one school training to CPL level in Ireland and that's EHA. A search should throw up the websites for most of these. As usual with flying schools, calling them will be more productive than email.
Personally I woudn't fanny about with non JAA courses as it can be tricky to convert. FAA plus JAA is the way a lot of people go. Also do a thorough costing of the course, including flights, living expenses, budget for contingencies, weather delays, failing the odd exam.
I did PPL in Ireland, ATPL writtens and CPL in the UK.
As for jobs, well that's another matter. Most operators would require you have some time flying in the airspace and weather you are expected to operate in. Instructing is the way most people have started out. There are a few instructing jobs that crop up. Other than that, it's the same as everywhere, people need high time turbine pilots. There is also some flying for owners going on, but that can be patchy. Busy as hell during the racing season, hit and miss otherwise. Mostly R44s.
When making your decision, take nothing for granted and confirm with the IAA that they will accept your chosen route, especially if you choose to mix the country in which you do various courses and exams.