Craig -
If a golf vacation in Ireland has a downside (and it is just a small one), it is that the most highly regarded courses in Ireland tend to be spread out all around the coastline of the island.
If you are thinking about a trip of 6-8 days, I would suggest concentrating on just one or two areas.
The courses worth playing in each area would include:
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Dublin: Portmarnock, the Island, the European Club (about 30 miles south of Dublin) & County Louth (aka Baltray, about 30-40 miles north of Dublin).
Southwest: Killarney, Waterville, Ballybunion & Lahinch
West Coast: County Sligo (aka Rosses Point), Carne (aka Belmullet) & Enniscrone
Northwest: Ballyliffin, Rosapenna, Narin & Portnoo (there are a couple of others I cannot recall)
Northern Ireland: County Down, Portrush, Portstewart & Castlerock
Sean Arble has posted excellent pictures here within the past week of several of these courses. Scroll down to take a look.
DT