Advice?

Looking for e-bike recommendations, especially newer or lesser-known brands with good value. I like dirt-bike, vintage, or café-racer styles and want something modifiable/upgradable.
Budget: $1,200 max
Use: Street riding and off-road trails
Speed: At least 35 mph, ideally upgradeable to 45–50 mph
5’3”, 185 lbs
Any models or brands you recommend or suggest avoiding? Looking to buy one under Labor Day sales this week, thanks all! :)