Hi,
running a Smoothie Mixer at the moment but as far as I'm aware the only other option is the Hope - Personally I'd prob go for Hope if I were to do it again - have heard reports about the mixer working loose repeatedly - mines done it twice so far.
Whereabouts in Devon are you? I'm originally from Ashburton.. I'm back over in a fortnight.
My steerer is about 195-200 I think but I've run the RC40's on 175mm steerer - wouldn't go any shorter than that though I don't think.