I bought an Abus Granit XPlus 540 230mm u-lock, which came with the Eazy KF mount for $210 Canadian.
I needed a mount that would offset the lock to the side of my frame, because my range extender battery is in the way.
The LiteLok X1 or X3 are also great u-locks, but I wasn't sure if the available tactical mounts would work with my bike.