I've had a remote start on two of my trucks. Both were installed by Audio Works in Newark. On my Civic I had a VIPER alarm with motion sensors also installed by Audio Works and that worked great. If someone walked right along side of the car and waved there hand near the window it would chirp.
Three Recommendations:
One thing I would recommend is that you go with a "two-way" unit. The alarm will notify the remote when the engine is started. This eliminates the guess work and allows you to start your car if you are not in line of sight.
Two that you ensure that the antenna is up near the rear view mirror this will make for good reception.
Three make sure that they put the LED somewhere very visible. On both of my Dodge's I had the LED in the center of the dash up close to the windshield. This illuminated the entire windshield when the truck was locked.
One final note not all shops will install remote starts into 5-speeds. This is because in order to make it work they have to bypass the factory sensor that won't let you start the engine without the clutch depressed. I'm not sure if that is illegal or not but if you leave your Jeep in gear and try to start it you'll have one helluva mess.