In that price range I haven't seen hydraulic brakes nor mid-drive motor. I had been looking at either one of these:
https://calgaryebikes.ca/collections...e-350w-36v13ah
https://calgaryebikes.ca/collections...rain-48v14-5ah
Or maybe stepping up to this:
https://calgaryebikes.ca/collections...ar-wheel-drive
The first two seem to be the battery being the big difference.
Looking more at Sliver's link, the promo code doesn't work, and you have to pay $150 for assembly. So leaning less towards those.