First of all, the bench grinder isn’t for sharpening. It’s for grinding out edge nicks and rough shaping of the bevel, not bringing it to a sharp edge. For this work you should use the coarsest wheel possible.
For actual sharpening, I can recommend what I use: an 8″ Norton combination oil stone, a hard Arkansas stone and a leather strop charged with green polishing compound. You should be able to manage that for under 100 pounds.