In answer to your question Leper, 2 million is a crazy price but people will pay the money, there are a great deal of areas in Dublin with this disparity and no I do not think 450K is a bad investment once all the other positive factors are in place.
So much of today's purchases are off the plans and you really have to know the builder, the company and previous work to get a feel for the finish and make sure that your building agreement stands up, however onerous it may be against the buyer. With small developments you actually get to meet the builder, visit the site through its construction and agree any alterations that you may like on the internal fittings.
Small apartment developments for example are located along the Clontarf Road, Sutton, one in Swords and Malahide.