I wonder if you can get a color sample from the appliance manufacturer and get that color matched at the paint store? Are they all the same line (otherwise there may be more than one white.) I myself don't mind mixing bright white with an off -white, large paint samples on craft board can help you find the right choice, hang them around the room and live with them for a few days, checking them in different light, morning to night. Is there any chance you could love your blue cabinets with some glazing --to get you to a color you do love? Confer with a pro faux painter if this is a possibility. They have a lot of color experience and can make up samples for you to choose from before you commit!!

You will need a good primer to cover the blue. I suggest zinsser BIN. There's a ton of different whites to choose from. I think it depends on your kitchen, counters, & preference. Are you looking for strikingly white or creamy? I like BM advance. What did you use to paint them blue?