Dealer installed options?

Looking to buy a 2010 5 GT this week. I'll be using S-plan, but I want to know how the added options work. Specifically DVD entertainment system and remote start. I see the prices have a retail price and invoice price according to online resources.

For example, the DVD is 1200 and invoices for 960 or something. Does S-plan save me for having to negotiate those pieces also? And the price should include installation correct?

Thanks for any info or help, and I know I can get aftermarket stuff cheaper I'm just going for Mazda parts for warranty and simplicity.

I believe if you have the options installed as part of the new car purchase, the option is factory warrantied with the car. You might want to check into this. And yes, you will be paying the dealership big time based on after market.

the dealer installed options do fall under warranty. i had my dealer installed remote start fixed under factory warranty.