Mate, registered here just to reply! I am 6'6" and 143kg, and I bought a Cube HD Fusion a couple of months back. Experience with Cube has been amazing and there's a contact I can give you on the down-low for a senior guy who is awesomely helpful, assuming he gives permission. 150kg "weight limit" on the bike, but Cube are confident it'll take even heavier riders and will warranty that.
Met another massive bloke with the same bike a week ago while out riding some rough towpaths around here. Do it: you won't regret it!