I like warm colors to stay together, therefore I prefer the greige next to the khaki. See if you can get a sample small paint pot from the paint store and put it on a few pieces of foam board before you commit to the entire kitchen. Test it in your kitchen on several walls and see how it looks at different times of the day. Check out the colors here. Warm neutrals is what you want to look at.

http://www.sherwin-williams.com/homeowners/color/find-and-explore-colors/paint-colors-by-family/

Unless you're doing different shades of the same color, it's very hard to get similar colors to look good together. I'd go with a contrasting color that would enhance color.