I've been looking at some of the comments on getting people with the right pronunciation for Duolingo. I can't really imagine how you would represent Irish on SSi unless you had three separate versions (Munster, Connacht and Ulster) or just decided to go with one on the basis of the most-spoken or just whoever you could find with the most authentic accent (that was still generally intelligible). The problem is also that the more authentic the accent is, the less likely it is that they are using standard Irish!
Apart from it being from my own 'backyard' the Cois Fharraige dialect has the advantage of having the book 'Learning Irish' available in a Welsh language version "Dysgu Gwyddeleg", pub by Prifysgol Cymru Aberystwyth, which might be of interest to those learning Welsh also. "Learning Irish" is by Micheal Ó Siadhail. It teaches only the Irish spoken out along the coast from Galway (with some non-standard spelling to reflect this).
The Irish of Tourmakeady (South Mayo) was very highly regarded but the number of speakers have declined a lot. North Mayo Irish on the other hand still seems to be fairly strong in one smallish area and has the advantage that, although a Connacht dialect, it has some tinge of a South Donegal pronunciation and therefore might be of interest to those who would like to move between Connacht and Ulster dialects.
I feel like I'm rambling on a bit here..... but I would be interested to read what others think. I'm not mentioning Munster dialect as more people are already aware of its importance and it is a large influence on the standard ('An Caighdéan'). Munster speakers would make the same comment on the influence of Connemara Irish.....