Consew, Juki and Pfaff are excellent industrial machines. Make sure it has a walking foot, reverse. These three machines usually come with their own table because the motor is attached to the table itself. Make sure the motor is in good shape.
I had a Pfaff 545 converted to use Singer feet, because back then the Singer feet were a lot cheaper to buy. You should be able to buy needles and pre-wound bobbins from an Upholstery supply shop.
If you can find these machines that were built pre-1990 you will have a workhorse of a machine.