I was in the same situation as you, up until 2 nights ago. I was considering the Commencal Meta SX, the Nukeproof Mega AM from CRC, as well as the Cube Fritzz 160, and the yeti sb66. The Cube is an awesome bike it seems, It was just too short in the top tube for me. even the XL was like 24", with a 22 inch seat post it just looked wierd.
What turned me off about the Nukeproof, was that it only has a 2-year warranty. I just cant be apart of that, as much as Id like to. I heard they ride spot on though, and If nukeproof had an extended 5 year warranty, Id be all over it. Hands down.
Yeti SB66 was just too common around my parts in the Rockies, So I went with the Commencal SX.
Im pretty stoked, but the frame was $1700(1000 Pounds) alone, and it cannot fit a piggy back unless you upgrade another 500 for a new chainstay. Why didnt Commencal just put that on for 2014, It was available??? Whatever Its so pink Im like oblivious to all else, I love it. and it doesnt bother me as much since I have a true DH rig and I need a 14.5 Kilo Freeride AM bike, but it may bother others who need it as a do it all bike.
Id go with the Nukeproof if you dont mind the 2 year warranty.
If your shorter than 6 feet tall, its safe go with the cube or the canyon, idk about the YT bike.