[KensRedZed]

DC motors usually don't make much noise. The gears maybe a little.

Generally cheaper than what? A 1:1 '63 split window Corvette at Barrett Jackson? 

A 25k Fox-10 runs like a bullet and costs $9 USD. A 35k slimline motor with way too much torque costs a mere $13 at Professor Motor.

https://www.professormotor.com/product-p/pmtr1532.htm

I'll reserve my brushless motors for my RC planes where the power to weight ratio has a greater effect than in cars.