I'm running a 203mm Avid with XTR lever and Nokon housing.
The brake is very powerful, but still provides enough modulation. Top brake (Y)
I never experienced any fading, not even after going down long hills.
I tried several Mono Trial's and they felt very nice.
However I prefer the Avid because it's cheaper and so simple to adjust and maintain.
No brake fluid means less potential problems. I'm not saying a Hope will leak, but I'm sure my Avid will never leak or need a bleed :)