i'd think the colored wheel might do better than the black wheel for not being so hot to the touch in the summer (it gets 105deg+ in the summer here)
.
also, i'm taking all the mercury emblems off the car and making it a ford, like our australian bretheren. i find the waterfall emblem of the mercury quite tacky.
and... the gauge cluster will be housing some white face reverse indiglo gauges soon, so i want to play down the black a bit.
i'm not 100% sure i'm for the grey though, either. i plan on going darker with the carpet, with either red or blue cloth front seats and door inserts. the back seat i plan on covering in a grey that matches the door panels, so to make the seat dissapear, giving it more of a 2 seater look while still having a usable back seat for my kids.