First time buyer here, what's a good bike that looks, feels and weights like a "regular" bike but just has a bit of pedal assist for up-hilling?

Never bought a bicycle before, just moved to a new city that is very bike friendly but I'm tired on relying on the city bikes

I don't care about throttle, speed, power, just that it feels good, doesn't look expensive, can give me a good cardio workout, but can also help me get to further places without tiring me too much if I'm feeling tired/need to go uphill/don't want to sweat

Ideally less than 700 USD

Should I just look for used ones in local shops? Or maybe find a good bike and add a pedal-assist motor to it?