I'm far from an expert and others that no more will be along soon I'm sure, but from my research, there's different brackets really. I think £2k is fine to start things off, I think you'll be looking in the upper end of that bracket. If you want to go to digital gears then you move up a bracket and are perhaps looking around £4k.
£4k is definitely too rich for my blood! My partner already, half serious and I think/hope half joking, said that if I'm going to spend £2k on a bicycle then she better be getting something sparkly for her as well. I think my head would be on a spike if I spent that much! Plus if I get into road cycling as much as I think it will it gives me something to aspire to!
In my research I was told that actually you get a lot of bike for your money with Canyon as it's sold online, so smaller mark-up than perhaps ones you buy in a shop.
I hope that is true as I really, really like the look of it compared to other bikes in my price range. Shame they're not available until October though. On one hand that's good as gives me a chance to get my payrise in but on the otherhand it means I miss all the great weather