Hi James,
Well done for making the purchase decision. It’s a great choice and I’m sure you won’t regret it regardless of the spec you choose … and remember that it’s
your choice no matter what other people say!
For starters I’d stick with the standard sound system. Big fat low profile tyres and stiff suspension generate a lot of road-induced sound, and the engine is directly behind you, so I doubt you’ll get the benefit of a high-end system unless you turn-up the volume to a high level.
I have my own option preferences which you may want to take onboard: auto-dimming and folding mirrors, PDLS (either), cruise control, climate control and the smoking package (I hate the ugly hole in the centre console!). To be honest most - if not all - of these should be standard on a so-called “premium” car, and I’m aware that no Porsche options are cheap.
Note that the standard aircon system is very basic (and a pet hate of mine!), with manual control of temperature and fan speed, and is totally unacceptable in my opinion, although others differ. The Cayman cabin is small, which means that the temperature can change quite quickly dependent upon weather conditions … who wants the distraction of having to fiddle with temperature and fan speed controls? That’s going back to the dark ages!!
You’ll never get back what you pay for options but they will make the car more attractive come resale. Choose what you want and what you can afford. It’s an expensive car and percentage-wise a few expensive extras won’t make a huge difference long-term if you’re planning to keep the car for a while.
I’m a fan of blue and red, and the CGTS looks really good in any of those colours on offer.
All just my tuppence-worth of course. [

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Enjoy the purchasing journey. When are you anticipating delivery?
Jeff