If you want good security definately go the S5, it doesn't come with quite as much in the way of features standard as one of the other packages but it is the most secure and it does have the ability to do all the bells and whistles as an upgrade.
Mine was $800 installed, included S5 alarm, tilt sensor, glassbreak sensor, turbotimer hookup. Was going to get GSM dialback as well but have
Snitch for that which works excellent
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