Hi,
the choices for DC motors are shrinking, they have largely been taken over by AC servos.
I use Delta servos, a Taiwanese brand made in China. Good quality, support, documentation and free set-up and tuning software at fair prices. From my regular supplier (in China)
I pay $438USD for a 750W B2 series (160,000 count/rev encoder) kit which includes the servo motor, the drive and cables. Pretty hard to beat that value.
Craig