Air brush and pump questions

Hi all,Sorry if I'm repeating, still trying to figure out the best way to post this question. I'm ready to buy an air brush set up and not sure how to choose one. Is there a minimum psi I should look for? particular brands that are good to use for chocolate? are they just regular air brushes but used for chocolate? I'll be using it to prep moulds, spray chocolates and show pieces, chocolates etc.Thanks for any tips.Greg Sorini