CompuStar is a great alarm system.
It is a full 2 way unit with an LCD remote that will indicate to you if the car has started, if it's locked, trunk open etc etc etc.
The alarm itself is manual friendly, requiring you to go through a process everytime you stop the car to "prep" it for it's next start.
Basically, all you do is stop the car and pull the Ebrake making sure to leave the car in neutral. You then remove the key, but the car doesn't stop running. The engine shuts off only
after you leave the vehicle and close the door. Once you close the door, the engine shuts and is "ready" for it's remote start.
Keep in mind that if you re-open the door or trunk anytime after this procedure and before the remote start, you'll have to repeat the sequence again to prep it.
http://www.compustar.org/security_with_remote_start.htm
I myself am removing the older alarm, the 2W900FMR sistem out of my old car, and transplanting it into my new 05 GT