Simon
Before you make a decision try and ride a few different models. I've had my 851 for 9 years. The bloke I bought it off sold it to buy a 916. He couldn't get on with the 916 and sold it not long after.
To me the 851 / 888 bikes have a more comfortable riding position than the 916 - but then I'm built like a baboon so what do I know
But whatever model you get .....just make sure it's red, there's a good chap