Is $4,750 to paint kitchen cabinets with standard paint a fair price?

We are having our kitchen cabinets repainted. We plan to keep the existing cabinet boxes but are getting new doors and adding cabinets above the uppers to take them to the ceiling. We've received about 5 quotes. Three painters use standard paint like SW Emerald or Gallery, and their quotes are about half the cost of the two painters who use 2k paint (Renner or Centurion). All painters plan to spray, taking doors back to their shop and painting boxes in place. The 2k quotes are coming in around $9500 for our medium/small kitchen with about 30 doors. The standard paint quotes are around half that. I'd prefer the durability of 2k paint but am concerned about the cost difference. I'm also a little nervous about painters using a product they aren't as familiar with. I'm going to get one more 2k quote to see if I can find one that fits my budget. Our existing cabinet boxes aren't anything special, which makes me think standard paint might be sufficient.