Thanks a lot everyone for your comments - I decided to go ahead with the purchase and buy the W205 C63 which is more stunning than I imagined in real life (and gives me the fizz just sitting on my driveway.. - will post pics to the appropriate thread in due course). Ultimately I think that theft is an important factor but I found myself agreeing with people on this thread like @John - buy it, protect it and enjoy it, otherwise what’s the point?
As far as protection goes, I’ve fitted a wheel lock (£20 from amazon) and invested another £20 in a faraday box for the keys.. I’m considering Ghost but also thinking about full PPF wrap which is over £2k and I’m not made of money! Have people had this done?
Great news...
You have to make the right decision for you but I know that feeling of seeing the car parked and getting excited about it and it means you bought the right car.