One nice feature of the Mopar OEM accessory remote start is that it has an 800 foot range (the factory remote start only has a 300 foot range on a good day, mine is more like 150 foot). And it comes with replacement OEM fobs that will be programmed to your GC.
If you want the feature, I would recommend getting an installed price from your dealer. Push them for at least a 10-15% discount on the part if you are having them install it, and if from the same dealer where you purchased your GC. Best luck.