Man, people really hate Chris King don't they! I don't really get the distinction between them and other expensive brands, but hey everyone's allowed their opinion.
I don't have a Hope headset, so can't comment – but I am a big fan of their hubs and brakes.
I do have a CK headset though, it was £80 at my lbs and the manager there, Rob Lee (Manager of Team Iron Horse extreme and Hope sponsored rider) talked me into it. He said, that at 24 hours races, they just jet wash all the bikes as its the only way to get the ready quick enough and afterwards have to rebuild everything (hubs, etc) apart from the headsets, which don't need touching… he said that in his experience the 10 year is not needed as they last longer – even with bad treatment.
I still wasn't 100% I needed one, but he gave me a personal guarentee that it'd last 15 years (he's a mate so I trust him!). Anyway, I worked out the cost against the FSA (which I've got on my other bike and does a good job!) and figured if he was half way right, it'd save me money…
Anyway, just thought I'd share that as it changed my mind – previously I wouldn't have contemplated spending more than £25 on a headset (FSA).
Admittedly it is pretty too, but I also got it fitted upside down… don't know why really, just didn't want to look like I was taking it all too seriously!
(P.S. Please don't insult me too much – I'm only a girl!)