Try the sport chrono, but I don't think you'll notice the loss unless you're gonna race between the lights. I'd go with the extra leather instead, though with the black it isn't as big an issue. If I was going for black interior, I'd probably just get the instrument binacle leather covered, the sides of the front centre console either side of the stereo), and the rear part of the centre console, and possibly a decent leather covered steering wheel. I've got leather rear centre console in addition to full leather, and I think it makes the car. But different people have different likes. I must admit I can't remember what stuff comes leather covered as standard on the S. I have to say I'd at least get the bit by the stereo done in leather.

The roof is probably going to show dirt the same whatever colour you get. I'd get black to match the interior - you have to think about what it's going to look like with the hood down.

But it's your car! Choosing the specs is one of the fun things.