07 dodge caravan remote start

I have an 07 Dodge Caravan that I need to put a remote start on. It already has the factory keyless entry system including the automatic doors and rear hatch open feature. I am just trying to find out what is recommended. All I want to do is add remote start to the factory system. Should I get the factory remote start add on or should I use aftermarket? If the aftermarket system is recommended what system should I go with and what all components will I need? I would appreciate as much information as possible. I would like to have a 2 way remote if it wouldn't cost a whole lot more. Most of what I have found aftermarket with a 2 way remote is a full security system and I don't want that. Mopar has a remote start add on that you can get a 2 way remote for but I don't know if this system would be as good as aftermarket and its pretty expensive. I also am needing to put a remote start on an 05 Chevrolet Duramax that has a factory keyless entry and need recommendations for that as well. But I can put that in another post if I need to. Thanks for any help you can provide.

if you wait in the next coming months viper is supposed to be coming out with a one button remote start pager type system i dont know exactly what features are =goin to be on the product but i will soon as i get back from the c.e.s show coming up in janinstallers do it best. we got the magic hands!