Sorry, I forgot.

I'm sure there is something in the market that will appeal to you. If a significant investment (probably), I personally would make sure that motor parts are, and will be, easily available (if mid-drive) and same for battery (if mounted internally). With hub motor and external battery mount, I think replacement will be much easier.

I'm fascinated with the Pinion transmission with integrated motor power unit. With a toothed belt drive, that's just an ultra clean and low maintenance setup. Availability on bikes has expanded greatly. Service... not so much. I think anything major and you unbolt the whole unit off the bike and ship it to Pinion. But they seem to be well designed and reliable.