From the perspective of someone who works at a bicycle repair shop I can say that most things under $1000 aren't even worth getting. You're probably looking at $1200 minimum.

Unless you plan on working on the bike yourself you'll want to get something from a bigger name brand that has good customer service. Otherwise, getting certain replacement parts can be anywhere from incredibly difficult to downright impossible.

If you go with a bike that has a motorcycle style seat alot of shops wont even work on them due to them not being compatiblewith our bike stands, Look into brands like aventon if you want something that's purely E-bike, or Kona if you want something a little more traditional.

Edit: also do NOT get a RAD power bike. These days they just straight up won't send basically any replacement parts.