Apart from the "can't afford it anymore" but
What's wrong (for me) with this one
Carbon sophistication, Bosch power and CUBE practicality in a light, easy-to-ride package
www.cube.eu
They've tried really hard and succeeded in keeping the weight down. Only 16.5kg, impressive.
A lot of that is the carbon fibre, and a little is the use of expensive components that are a bit lighter than lesser versions i.e. Shimano XT.
I'd be disappointed with only a 400Wh battery, but that is only a problem if it can't manage the range you need. Small saves weight, but probably only half a kilo compared to 500Wh.
You'd have to think about the motor: it is only the 55Nm Performance SX, presumably chosen for lightness. Not as beefy as the CX.
Biggest gripe of course is the £4500 price. For me I'd say 'well done guys, impressive weight' and then buy a heavier 625Wh, Performance CX bike for probably not much more than half the cost.