Salon paint

Hi. Was wondering if any painters can advise me on a decent washable paint as my father in law has just built my missus a salon at the house. It's a summer house style with plenty insulation etc and walls have just been skimmed and base coated. So I'm needing a tough washable white paint for the walls and ceiling. I know dulux is decent but I was looking for some trade advice on brand for your buck as dulux is pricey. Thanks

 

Thanks for the replies guys. It's not as much that money's tight, I just wanted the best available for the money.

 

Think I'll go for the diamond thank