[mutant chicken]

You cannot get heated seats.
You can get the sound system.
You can only get the remote start on an automatic trans, but you lose the LS3.
According to the Chevy website the gauges aren't an option, but I think you can have them dealer installed.. don't quote me on that though... anyone ?

Spend the few extra bucks now, it will make you happier in the long run. I never thought I would want heated seat in a car but I use them all the time in our Tahoe, and the universal home remote is awsome, no more multiple garage remotes in the car ! Bluetooth built in ? Come on ! I don't want one of those stupis things in my ear, and in CA. it is the law to be hands free on the cellphone.