not completely sure what you are looking for (torque, rpm, bus voltage).
But using an industrial AC induction motor gives you this power level for below USD 2000 (using alu frame to achieve low weight).
Have a look at ABB (expensive but large variety of motors) or other industrial suppliers. Go for a 220 V version, and you will have rated torque till ca. 2750 RPM. Look for a nominal 20 kW, with the 220 Delta version you get. ca. 35-40 kW nominal at 400-440 VAC (ca. 600 VDC), then taking into account the peak/nominal ratio (typical 3 or better) you have a 90-120 kW peak engine. THis is similar to the work done by some guys at www.aeva.asn.au
These motors are fan cooled, so less issue with cooling too. Only disadvantage is max rpm is only 5000-6000 rpm, compared with 9000-11000 for "real EV motors".