The shuttle bus from Grange Rath to station is about €12 a week (according to their ad), and not sure about the build quality problem, but I know a few who live in Grange Rath, and I have to say, the houses look lovely inside - very spacious and very modern looking. Sure its a Godzilla of estates, but they also have tennis courts and lovely woodland setting to the back etc. A 3 bed semi in Park something (can't remember) was 230k this time last year in Grange Rath, and its above 310k last week.
In Wheaton Hall there are a few four bed detached on market at the moment - the asking price for the one at the back of the estate is around €430K, just to give you an idea - red-brick-fronted houses, about 10 years old, and the shops and pharmacy is very handy indeed.
I was told FiveOaks houses are really nice, and same with Stameen, only more private and nicer! Bryanstown Manor / Martello Village (right opposite to the train station) are very popular with commuters I guess - a 3 bed duplex (some 1400 sqft!!) was 220 last year, and similar being sold for more than 300 this year!!