I just got back from a authorized installer of clifford alarms and they wanted $700 installed for the matrix series. I was wondering were is a good place to buy clifford alarms online cuz i really dont want to pay retail. He said the install itself is going to be $150. This is going to be installed on a 2003 Lincoln LS. Also what if any other things i should buy to add to the system or which system to buy. i want one with remote start, windows down, shock sensor, siren, etc.