The new S3X hub will be available soon for £250 plus wheelbuild and fitting. It will be available in 120mm and 130mm widths with either a bar end or straight bar shifter. Both shifters can be converted to a downtube shifter if required.
 
One thing of note is there is only a 12 or 13 tooth sprocket option for use with a 3/32" chain. Other than that there is enough options to suit most people. We have one on test at the moment.