Drinnagh Wood is a lovely estate but not great in terms of services being within walking distance. The nearest shop is a good drive away and while there is a "path" of sorts to the train station I certainly wouldn't be walking it in the dark. If you have children how would they get to school?
The plane noise isn't as bad as you might expect. With decent double glazing - which all of the houses have - you won't hear much and after a couple of days you won't even notice them passing overhead.
Personally (and I know the area very well) I wouldn't live there due to the lack of services. If I had that sort of a budget I'd consider somewhere like The Dunes which is far more established and very close to services.