Have you looked at Alabaster? Different rooms are going to show differently with lighting by day then by night. Best thing to do is select a couple of the colors you favor and get a couple of poster board cut in to 4's and leave the outer edge of the poster board white so your eyes don't play tricks on you. That is really the only way you will know if it turns green, blue or other in your particular space. I do love Shoji White. Shoji White is the perfect warm white with a gray undertone; it looks beautiful with wood or metal finishes. Yet, you need to see how it looks in your space even though it's under construction. If you have lighting in then you can see your picks placed on a few different walls so you know they don't change AM to PM lights on and off. Modern Gray is very pretty and if you find it a hint too dark given SW sells larger sample cans you can have them lighten it 25% (25% will be a very, very little bit lighter or you can do 50%) after testing it by taking the can back to them and telling them to lighten it. Concerned it might be cold, but do love the color. If you google Modern Gray by SW you will see it changes a lot in different rooms.

The gray you choose needs to go with your floors, first and foremost. Take a flooring sample to SW to choose.

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I bought 5 samples today, one of them was a white for trim so just 4 for the walls. After considering what I already have, I decided to pick ones that had different undertones. As an example, I didn't get Horizon, b/c it's so close to Paper White, and i have that color in two rooms in my current house. It's pretty, but it definitely reads blue. I think this is partly due to my trim being Snowfall White, which is very close to Simply White. I think with a truer white it might appear a little more gray, although still cool. I ended up with Intense White, which is actually what I had wanted to use in one room instead of the Paper White. Also got Shoreline 1471, which reads a little more gray than Horizon, although I feel like the purple will come out I wanted to make sure. Also got Classic Gray ElleN, I'm going to give it one more shot. And Swiss Coffee, b/c my sample is so old for that one. I feel like with what I have and the new, I should definitely be able to come up with something. I buy these small flat canvases at Walmart in a 3 pack and they work amazing for paint samples. I have found that even foam board can curl pretty easily, and I'm not a fan of painting directly on the wall anymore, have screwed that up too many times. ElleN I agree Halo is very green, so I don't think it will do me any favors. And Gray Mist is not a very fun color, but I can't believe it looked so yellow on your walls. I think you're right, they might have mixed something wrong. Here's a couple of pics of our old kitchen with it. It was a great neutral with the floors, cabinets and countertops.