I sold my first knife in 1980. Since that time I have sold lots of knives and have put almost all my profits into equiptment. I have a Square Wheel Grinder, a Burr King, a JL horizontal grinder, a Dozer grinder, and one modeled after the Square Wheel that I built myself.
I like all these grinders. I don't think a person will go wrong with one of the above grinders or the Hard Core, or Bader, or the ones that Rob Frink makes. After all, its not the grinder, its the craftsman that uses it. I know knifemakers that don't have half the equiptment I have that make knives much better than I do.
Having said that, I would hate to do without my Square Wheel grinder. I have built a lot of custom attachments for it, and can change it from platen to contact wheel or one of the other attachments in a matter of seconds. I would recomend getting a variable speed motor if you can of at least 1 1/2 hp. Of all my grinders, I probably use the Square Wheel Grinder the most.
As long as you get one of the top name grinders I don't think you will go wrong. They are expensive, but can pay for themselves in a short time. Hope you can benefit from my experience, Tom Lewis