I just received a canyon nerve xc 6.0 yesterday, has lock out both front and back.
First ride today and very pleased. I am 5.7 and got the small frame which fits me very well. Don’t know how it it compares to other full suspension as this is my first. Been using 69er single speed so this bike very different but really enjoyed it today.
I was very surprised how little i used the lock out, it climbs really well, even when i was standing without being locked.
It is only slightly above your budget and i suspect you will not find a better spec bike for the money even if you look at 2011 old stock.
Canyon offer a 30 day return policy as well.
pedalon have really good reductions on 2011 Giant bikes at the moment (Anthem X5 for £900, which is saving of 500)
Hope this helps.