definitely try to get all of the extras you can think of out in the open and on paper right away before you break ground. the price should be negot. esp. with the economy right now. later on they will all be a fixed price cause then they have you. also if allowed locally try to do some of the work yourselves, like painting staining insulating anything you can a little sweat equity never hurts. in reference to the extra tv/phone jacks, we have always built ranches but I always put a sleeve into the basement from those locations, then you can switch the phone or tv from place to place or upgrade the cabling if needed. I also got material lists from the lumber yards and verified all materials, there was always extra stuff in there that can be deleted or picked up by you for less.