OP - it sounds like you want what I also require. To make the car easy/simple/quick to wash, and keep it looking A1 for the best possible amount for time.
I know you said you want to do it yourself, but for only a couple of hundred quid more (than it'll cost you to buy the products yourself), have you considered getting it done by a professional detailer who also has access to superior products that you can't buy off the shelf?
Mine goes in tomorrow for a 'new car' detail by somebody who uses Kamikaze products, he is Kamikaze approved & accredited.
Following a prep to get rid of any swirls or imperfections, the paint gets a coating Kamikaze Zipang, then he will apply a coat of Kamikaze Miyabi for ultra gloss & durability. This dual process (using products only available Kamikaze accredited detailers) also creates a 'self-healing' finish. He uses Miyabi on all the exterior trims and engine bay plastics. Kamikaze Intenso will be applied to all the glass. Wheels are removed and Kamikaze Stance will be used on the wheels, callipers and exhausts. Inside he uses other products from Dr Leather, Aerospace and Gtechniq.
All of that comes with a 2-3yr guarantee. His rates are VERY reasonable (significantly cheaper than I was expecting or quoted elsewhere!) and he has an excellent reputation across the forums. He regularly does Golfs, Seats etc, but also works on other exotics
I see you're in West Sussex, which isn't too far from where he is (South London/Surrey), so if you want me to put you in touch drop me a message.