Keith,
(Tried to PM you, but your mailbox is full).
Just wanted to say thanks for the advice on the stereo install joints, and the heads up with Compustar. I did spend lots of time tonight comparing various brands of security systems, etc. - and Compustar did seem excellent.
In short, I just purchased one of the high-end systems from CompuStar on eBay. Among a plethora of features, (remote start, 2-way paging, etc.) it comes with a dual zone impact sensor. In addition, I purchased two additional aux. sensors (dual zone motion and tilt sensors). I canceled the date with CarToys (found other forums that confirmed your feelings on CarToys). I'll take it in to one of the joints you listed and get it installed sometime next week.
Thanks again. See you, and everybody else, in a few days...
-biju.