Acrylic is easier to spray and make look right, 2pack is thicker and harder to spray and get looking nice. I'd say due to the 2pack being thicker it would be more durable, however you do enough coats of acrylic it will be fine, plus with enough clear it'll look deep.
He would do it now, but I doubt you would be happy. He still has a lot to learn thats all.
Normally it's around $500 plus paint for it to be sprayed.. Depends weather you supply your own cutters/polish (some people prefer certain products). You get what you pay for eh