I've been using a Coote 2x6x48 belt grinder for about 20 years. It is a great heavy duty machine. I simply change pulley sizes to vary the speed. Even though it is "small", I have made everything from bowie knives to small pairing knives to razors with it. They are about $400 plus the motor, shipping and mounting. If you pick up a used motor, you can have everything for under $500.
Coote Belt Grinder