A friend of mine just purchased this unit from Sams club
http://www.samsclub.com/sams/revo-16...navAction=push
He choose this unit because the system can be viewed live on most smart phones or any internet PC/MAC. It will also automatically notify you with Push Notifications when any or all of the cameras detect motion. Also You don't have to pay a penny for that service all you need is the internet connection.
He plans on installing it this week