Feeling a bit uncomfortable

The title says it all really. We went back to the display over the weekend to check out some areas of the house and to check room sizes, as I am concerned at the really small bedrooms. S and I spoke about it and we are feeling a bit uncomfortable with the "PD experience" at the moment. The tiles thing is really worrying me, basically we can only choose from what they say we can have regardless that NT have others available in their showroom. We have a lot of provisions in our sales quote and the provision for site costs has jumped from 15k initially to 20k and it is still unconfirmed until tender.
From reading the forum at HomeOne (http://forum.homeone.com.au/) PD seem to be very bad at the communication bit and very good at saying "no", even when they have said "yes" to the same thing on other builds. That is our experience at the moment for sure. It also looks like quite a few upgrades are the opportunity to bite a bit harder. But that is the price for a volume builder. We are questioning if that price is too high for us.
We have decided to keep our options open and keep looking at other houses, the Metricon Bel-Air 37 looks a possibility or the 33 with some changes. We have also given a sketch plan of the best bits of all the houses we have seen to the guy we bought our land from, as they work with a builder and we will see what they come up with. We'll get to tender with PD and then assess it at that point.
We are not committed until we sign on the contract and PD would do well to remember that fact, and a bit of service (or a returned phone call) would go along way.