I believe the specialized crux elite ali frame is a winner…however I heard the geometry is suited more for american cx (as they have a lower bb) European cx geometry have higher due to all the mud (might be wrong though – but something to consider)
The Stevens bikes from Germany look good.
The Columbus bikes from Paul Milnes are tried and tested (very popular among racers) ali again though.
have you looked at the singular kite – thats steel and race geometry!
the focus mares look good (Rapha will be racing on the carbon version next year) the owner is apparently an old cx champion too.
Id be tempted to try a low weight ali frame and some tubs!