Pretty much any direct drive hubmotor can handle 1500 watts, though they may be rated lower, like 500-800.
One of my favorites is the 9 continent, or the motors that other manufacturers made that closely imitate it. Mostly because they retailed the cheapest.
Ebikes ca, EbikeKit, Amped bikes are the USA sources. Emissions free in china likely the cheapest source. Sometimes you can get a deal on a close out, scratch and dent, etc. Or a used one on our for sale used board. Usually about $100 used.
You might start by asking Lester at Chicago Electric bikes if he has any old used motors laying about. That is, if you are on a budget.
If not, the motor from ebikes ca is hard to beat for value.