I don't think he is asking for pressure settings, but rather how inexpensive a compressor he may get away with investing in to use one of the little handheld hoppers.
Jedi, almost any little compressor will give you much more pressure than you will find you need for those $65 Home Depot hoppers. They typically need from 12 to 40 pounds. BUT the problem is in buying a compressor that will steadily maintain the desired pressure setting at a constant rate (Cubic Feet per Minute: CFM) that won't drop off while you empty the air tank, and won't burn up a tiny, cheap compressor.
Stay away from the little round 'pancake' compressors. As my father-in-law used to say: "They are only made to sell." Get one - while you are investing - that will also run nail guns and air tools. (air tools take a lot of CPM) Just buying one to spray with is a pure waste of money.
"True eloquence consists in saying all that is necessary, and only that which is."
François Duc de La Rochefoucauld