Well with your budget i kinda rules out a full suss as you wont get anything good for that money and it will be too heavy. Hardtail is the better option at that price.
Cubes are always good value and you seem to get some better parts for less cash so id go with that one. You might be able to get a better deal or a higher spec Cube on Chain reaction for less money but i guess that depends on your bike to work limitations.
Wouldnt bother with the Ridleys, good bikes on the road and in CX bit not very popular here in mtb. As youe not buying till oct you would get a better deal on a 2012 bike as new stock comes in and shops discount old stock.
Giant xtc are also worth a look, good value and fairly popular.