any limiting parameters other than size? Some of the cheaper offerings are rim brakes, I wanted disc brakes on mine. I had a Boardman CX Comp reserved when they had a promo on (so was £720 down from £900),
http://singletrackworld.com/forum/topic/boardman-cx-team-720-with-current-promo-anything-better-for-the-money
but ended up getting a 2013 Saracen Hack 2 reduced from 1100 to 650.
The 2014 model is cheap here
http://www.ebay.co.uk/itm/SARACEN-HACK-2-CYCLO-CROSS-BIKE-SHIMANO-TIAGRA-CARBON-FORKS-FREE-DELIVERY-/111421984144?pt=UK_Bikes_GL&hash=item19f1448d90
and it is a proper CX bike (angles, stay length, massive clearance), but marketed as an urban warrior and shod with slicks as stock.
Heavy wheels but par-for-the-course, keep making myself step away from the £240 Kinesis CX wheels at Freeborn as the whole idea was scratching the n+1 itch cheaply!
BC members get an extra 10% off at halfords, so combining that with a bike promo could net a real bargain.