I am inline with your thinking on the 'extras' impacting the bottom line price.
I have a datapoint for you. Just bought and promptly blew up a good-condition Alpine Silver 01 S.
I'm asking $6500 for my roller, I justify this with brand new michelin pilot sport tires, BBS wheels, new brakes all around with perfect red calipers, pristine top with perfect clear window, touch-screen bluetooth, bilstein shocks with H&R springs and updated suspension, great condition Litronics HIDs.
My thoughts are, the parts listed above are near my asking price.
I'm an anecdote, but maybe this helps you price yours.