I wouldn’t only look at 1×11 specced bikes, it’s only the cost of a chainring to convert (raced a season of CX with Sram Rival converted to 1x with just a narrow/wide ring, no clutch mech, and had nothing even threatening to be a dropped chain).
If it fits you, this lovely Marin from Discount Cycles (mail order arm of Broadribbs shop in Banbury/Bicester)
http://www.discountcyclesdirect.co.uk/catalog/product.php?CI_ID=18688
The Vitus from CRC.
A Viner/Tomac from Planet X if it’s in the sale. +1 Alexsimon, I’m close to being a h8r but a mate bought one on my recommendation, in the 35% sale it was £1K for similar spec but better wheels to my £1500 (reduced from £2K) C’dale SuperX.
Fuji Altimira CX from Evans.
I wouldn’t get “hung up” on carbon but when you can get a decent quality carbon bike of similar spec for the same price (either from a direct seller, or reduced) why wouldn’t you?