By good I mean one that really shuts the car down if someone tries to steal it and cant be bypassed. I know if they want it they'll get it but the harder it is the better. One that has remote start and preferrably will roll the windows up remotely as well. How much should it cost installed properly? Also are there any shortcuts that installers use that I should be aware of? Bad shortcuts to make it easier on them is what I'm referring to. Thanks for all your help in advance.