Hi karent,
Not being a big fan of the bigger cities, I would have no problem not staying in Galway (out of all of my trips - five, so far - I've only stayed there once, and have no burning desire to go back). Clifden is beautiful place, and driving Sky Road is terrific (as is walking to and around Clifden Castle). And of course Clifden isn't far from the Doolough Valley, Aasleagh Falls and Killary Fjord...all worth seeing.
As for your 2 nights in Lahinch, it does set you up nicely to see Doolin, The Burren and the COM. A few suggestions: as you make your way to Lahinch, make sure you go via R477, around Black Head and along the coast. The scenery is incredible. There's an area known as Bothar nA hAillite (the "Baby Cliffs"...should be able to GPS it) where you can get out and walk right to the edge of the cliffs. Another suggestion...on your way to co. Kerry, before you take the ferry from Killimer to Tarbert, I suggest you make a bit of a detour to see the Kilkee Cliffs, Bridges of Ross and, if time, Loop Head. To be honest, we actually love the Kilkee cliffs more than the COM. No, they're not as high, but they are more dramatic, and there are hardly any crowds. And the Bridges of Ross is pretty amazing, especially if you walk out to the very end of it.
And finally, I also suggest going through the Conor Pass......the view from the car park at the top is stunning.
Hope this helps.
-Russ