Compustar.org offers the one I am planning to have installed. Uses spread spectrum technology to extend the range from around a thousand feet to 1 1/4 mile. All the bells-n-whistles for 750 installed. They offer the standard 900mhz version for a couple hundred less ( range copares with other brands - like viper/autopage ) Good comments about this topic here CLICKME!

When I get time to LEAVE my VX with them for a couple days - I will not have to shiver to crank my ride. I am getting the remote start - alarm - remote rear door popper - windows roll up/down and sunroof control modules for around 900ish. Has remote page - meaning, someone can tap on your windshield - and you will be paged to your car. Different stages of impact would generate other - louder - responses. Remote vibrates or beeps. and it DOES fit on the keychain too.

Feature list
Alarm
Starter
Keyless Entry
Two Aux Outputs
Starter Kill
Anti-Grind
(-) True Status Output
(-) 2nd Ignition Output
(-) 2nd Accessory Output
(-) 2nd Starter Output
Manual Transmission
Diesel Engine
Shock Sensor
Extra Sensor Input
Door Sensor
Trunk Sensor
Siren
Horn Output
Tach/Alternator Engine Sensing
Remote Paging
Cold Start
Timer Start
Factory Rearm/Disarm outputs
Dome Light Supervision
Dome Light Factory Rearm
LED
Unlock before Lock after starting
Second Pulse Unlock
Driver's Prioroty Unlock
Anti Jacking
Turbo
Passive Arming/Locking
Ignition Controlled Doorlock