What about a very soft grey? Beautiful!

I think all white would be lovely, but it's too difficult to choose from a computer screen. I also agree with phuninthesun...a soft gray or greige could also be nice and would provide some contrast.

I think the current paint is showing through your samples, giving them a pinkish cast. I agree w/ KHB, use posterboards, or primer a section, then repaint w/ your 3 colors.

KHB interiors. Would you just use the same color as the trim/wainscoating? Or do you think its worth trying to do a slightly different shade?

Julie I know you weren't asking me, but I would use a color slightly more grey than the wainscoating.

Same color as the wainscoting. If you don't have significant contrast in a different wall paint, it will look like you could not quite match the original wainscoting paint.

Hello. White looks quite not badly, it is even excellent. Therefore I, definitely, would paint everything white.