If you need power to push you up the hills, you probably want an ebike with powerful motor and throttle.
Although Dost comes with a powerful motor and throttle, like you said, getting support might be a frustrating process.
Giant comes with a Yamaha motor, which is probably a 350W nominal and 80nm torque and has not throttle.
You may want to try Watt Wagons City Commuter. It's their newest and the most affordable model but should meet all your needs. They are also located in Boston, so it's somewhat of a local support. The owner
@pushkar is very active on this forum and well regarded.
I posted the following configuration for another new ebike shopper which may work for you as well. The City Commuter goes about 30-35 miles with PAS.
You can read more about it on this thread.
Hey everyone, I am happy to announce a brand new addition to the Watt Wagons family - the incredible City Commuter - a full featured ebike built for city commuting, includes battery, fenders, rack, front and rear lights, carbon fork, carbon handlebar, AND kickstand at right around 50 lbs! I...
electricbikereview.com
An incredible class 3 full featured ebike, with throttle, at ~50lbs! Bafang M600, 11.6ah 48V pack 30-35 miles range with Pedal assist Shimano G-C7000-5D 5 speed IGH, Belt drive, Throttle Carbon rigid fork. 27.5x2.1 tires. We can swap out for 700C tires Carbon handlebar Carbon Seatpost Tektro HD...
wattwagons.com
For your budget and your needs City Commuter configuration I recommend is:
- Default battery (you shouldn't need a 2nd one for the distance you're describing)
- Suntour Mobie 45 suspension fork
- Shimano G-C7000-5D 5-Speed IGH
- Tektro 725 Brakes
- Default rack
- Default Light (Lezyne Macro 1000 Lumen)
- Default Tail Light (It's brake actuated)
- Carbon Riser Handlebar
- 2A Charger
The total for that configuration should be $3297
If you go with the Magura MT5e Brakes then the total would come out to $3496
The bike comes standard with two top end components
- Kinekt Suspension Seatpost
- Brooks B17 Imperial Saddle
You also have to consider that this bike comes with Gate Carbon Belt Drive which requires no maintenance and will last 4 times longer than a chain/derailleur/cassette which you will need to maintain and replace.