Obviously a colour combination/wheels that you like will be on the list, I merely didn't want a black one but it's pretty subjective - that said the blue grey (Satellite I think?) with silver wheels, black exterior pack and cream seats does not work!
They all have the sports exhaust, if the switchable button isn't fitted then putting the car in dynamic mode opens the exhaust up anyway amongst other things. I wanted configurable dynamics where you can adjust the different components individually - my previous car had all that switchable too and it was great for switching between daily use and a bit of a blast.
Worth trying the seats for comfort/support etc., the standard 'Sports' seats didn't have enough (any?!) side support so the Performance seats it was. Contrast stitching is pretty rare as that was part of the expensive premium leather option.
Parking camera and front sensors are quite common, other convenience features are preference - I wanted heated windscreen and auto lights/wipers. Flat bottomed steering wheel is quite common too though heating is rare. I don't think I've ever seen one without heated seats or wind deflector, not sure cooled seats were an option until fairly recently.
I wasn't fussed about the sound system, it's a convertible so the acoustics aren't going to be great anyway and there's a better soundtrack available at the press of a pedal

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I think the options changed a wee bit from 2013 into 2014 where some were bundled together into packs instead of being available separately. If you can get the VIN there's a thread for how to get the build-time list of options, though mine has quite a few that weren't on there.