doing a remote start and keeping a factory key-less is about $40 less than a standard remote start as the only part that changes is the remotes. The problem you run into is most factory key-less entry systems will disable when the vehicle is started. so go start your car and see if the factory remote works when the car is started. if it does you can get away with a one button remote start system other wise you will want to get a system that does locks etc.