Free Speech - who did your neighbour use? I didn't think there was another co. in that area. Great because, as you said, Griffner are expensive!
Aphrodite - for a builder you could try Murphy New Homes - they build in Donoughmore - actually I think they only build their designs - worth checking out though - if only for prices.
TimberFrame - we priced IJM (Monaghan), Century (Waterford), Cygnum (Lissarda now Macroom) and a few smaller local co's. We decided to run with a co. who had been doing timber frame for a considerable amount of time - too many new co's at it. We decided on Cygnum and went for their Silent Home Package - but we're still waiting on planning so no further experience to share with you. Best of luck with the build!