Ok, thanks for the information. One more question, can anyone tell me the difference between the Vista 15p and Vista 20p? Which is better in the house I described above? Thanks
For what you need, there's not too much of a difference. The 20P can handle more zones, more users and allows 2 partitions as well as a few other things. For the house you described, either would work just fine. However, the 20P is very close in price to the 15P, so as long as your buying it you might as well get yourself the 20P in case you want to expand in the future.