Greenhills and Greenpark in Dublin 12, are very nice areas, however the house prices well exceed the 430k (starting price). A house in greenhills recently sold for 460k. The area is very nice and safe.
A house on the Limekiln Road - facing the park (tymon) is currently starting off at 425. I wouldn't pay that for Limekiln. Im not sure if they were corporation houses?
Amazingly on the same road (limekiln, there is a house on the Myhome.ie site which is in the high 600k mark - they have put the address as Limekiln road, Terenure, D. 12. This is a different home of course, and not part of the limekiln estate. However its 5 mins walk down the road!!
Greenhills has two bus stops 15a / 19a that both go to town. Reliable service.
Walkinstown is a great location to travel from, buses, and it does not take long to get to town by car!!