I'm looking for a motor that is 48V 2800 rpm and 20 lb-in of torque. In other words, something that could use your HBL1650 controller. NPC seems to have smaller motors.
Would you have any motors in mind that the HBL1650 was built for?
Please take a look at the motor: www.robotmarketplace.com/products/ETK-ETEKBL.html
If it is too heavy/powerful for your application, there are lighter less powerful motors like the Anaheim Automation BLZ36 series, or the BN23HP from Peromatic Moog motors group.
Also please consider our controller VBL1650 which is in stock ready to ship. It is nearly identical to the HBL1650 except it has fewer digital pins.