I am cancelling because they are changing so much and putting 16gauge wires. I spoke to a local dealer and he said, I don't ven need to do 5.1 pre-wire, I can just do it for the 2 back speakers. Also, since I have unfinished basement, he said it will be easier to do it later with better wires.(14gauge)
Also, the builder's vendor is not good at recommending location etc. Plus doing it later will be more accurate as furniture's will be already there and we can choose the location accordingly.