Diving western Ireland (Eire)

My wife & I will be visiting the west coast of Southern Ireland in May next
year, as that co-incides with our tenth anniversary where we spent our
honeymoon touring Ireland from Rosslaire to Donnegal on a pair of
motorcycles. At that time my missus was not a dive (she did not even know
that I was), since then we've spent the last 8 years diving the UK & abroad.

This time we are going in our (recently bought) motorhome, with the dive
gear, so we're looking for recommendations of diving locations and dive
centres.

We want a dive centre that offers Nitrox and possibly Tri-Mix, has a good
boat (and skipper) and plenty of decent sites including wrecks as well as
some good photo opportunities.

TIA

Tony Howard