What time of year ? Also that would give you one full day in the location ? Trying to see the Arans and the Cliffs of Moher adequately in one day would be really tough. Doable but very frantic. Cliffs of Moher are spectacular but tourist clogged and for my wife and I nowhere near as wild, beautiful or moving as the Cliffs of Kerry on the Skellig Ring very close to Portmagee and the Glen.
The Skellig Ring is incredible and the south side of the Ring of Kerry - Waterville - Caherdaniel - Sneem - Kenmare route has everything - incredible scenery, beautiful small towns, historic sights, pubs, shopping etc. Really anywhere from Portmagee down to Waterville and over to Kenmare is fantastic. Really depends on what specifics you want and how it fits into the trip to Dingle. We loved the Arans, Doolin and Moher but strongly urge the Skellig Ring and the south side of the Ring of Kerry by far over your other options. Nice thing is other than trying to do too much and not absorbing the best of Ireland - it's people and the small moments that turn out to be the most important moments you really can't go wrong.