I'm going to step outside the mainstream box and mention a bike that my wife and I both test rode earlier this year at a local bike shop -- the Tenways Ago T. Although my wife ended up buying a different bike that day, the description in your post reminded me of that test drive. It's hard to explain, the Ago T just felt "light" compared to other belt driven ebikes we had tested. For some reason, it rode more like my traditional Trek 12-speed -- but with a motor. Strange, given that it actually weighs about the same as the Gazelles we had tried, and they were very similiar feeling, but the Ago T just seemed to get-out-of-the-way more than the others.
On paper, it checks all the right boxes: Belt drive, mid-drive motor, low-step thru frame, internally geared hub, torque sensor, hydraulic brakes, and front suspension. The motor, a Bafang M420, is pleasantly quiet, and being a name brand, is most likely serviceable at a local bike shop. It isn't as silent as a Brose motor (like you would find on Specialized ebikes) , but certainly not intrusive, and edged toward a slightly quieter sound than the Bosch motors on the Gazelles we had tried. The manual shift is a stepless (infinite range) twist grip Enviolo hub -- also common and readily serviceable. The 14Ah (500 Wh) battery falls in line with several of the Gazelles. In the lower pedal assist levels, you shouldn't have any trouble falling into your requested 25-50 mile range. Ride and spec-wise, I'd consider the Ago T similar in many ways to say, a Gazelle Arroyo C5, but $1300 cheaper ($2699 vs. $3999).
During a side-by-side test drive that day, for some reason the Specialized Como 4.0 (rated 70nm) had more oomph than the Ago T (rated 80Nm), which was surprising. I'm 250lbs, but if you're 150lbs or less, I'm pretty sure this difference would be a non-factor, unless you plan on consistently riding in an overly hilly area. The only other thing worth mentioning here is that I have no experience to share regarding the customer service and/or longevity of this brand.
Just another brand/model to consider.