Sorry, posted before checking that i had answered all questions, i'm not sure about detached houses but most detached houses are going from over €550k at the moment, no idea what they were in 2004.
It all depends on the estate, Fox Lodge prices are around €750k for a detached. Jamestown Park around €650k, Clonkeen €600k. Its also depends on the size, alot of the detached houses are 4/5 beds, the Fox lodge houses are quite big.
Have a look at Ronald Duff - [broken link removed] and McConnon estates [broken link removed]. and myhome.ie will be worth a look.
regards,
KatieAlice