Yes, they will look fine in white. The linen white isn't super cream, it's just a warm off white so white toilet, tub and sinks will look lovely with it.

For all of our trim and doors, I chose to use a soft creamy white that has a slight yellowish tint to it. I love the way it looks. The one we used is Behr's Pot of Cream and IMHO it's perfection. While refurbishing the foreclosure home we bought a couple of years ago, we've added crown molding and replaced every door and piece of trim in the house. Everything is now painted with this same white and I'm tickled with it. It's not something anyone else notices, but I love how it's nice and crisp but easy on the eyes. There are hundreds of whites and when you put them directly next to each other, yes, you can see their differences, but once you pick one and put it on the trim and doors, it will just look white and really only you will probably notice. Our floors are walnut and oak and I've used cool colors and warm, regardless this Pot of Cream white looks great with all of it. I've even painted furniture with it and plan on eventually painting our kitchen cabinets with it too. In regards to the switches and covers I have just used standard white of each. None of them sit next to the trim and they all blend, but there are light switches you can paint to match. The vent covers I'd leave alone. If it were me, I'd never opt for builder anything. Take the designers advise and pick a soft creamy white.

BM Chamois is a warmer white with some yellow undertones, but the current trim color looks fine to be next to the cabinets so if it's close and you're fine with it I say stick with it. Really unless you use the same color as the cabinets it won't be an exact match. Can you paint a sample of the Chamois and hold it against the cabinets to see the contrast? IMO since you have the bright white cabinets and grey soapstone I'd play it safe and go for a cooler white. BM chantilly lace or BM super white would work.

Lori! Thank you! I have an Alabaster sample so will definitely take a re-look at it. Do you think that Alabaster or White Dove will lend too yellow though? I'm not against painting everything Extra White, but am afraid it will be too stark. For White Dove, I've heard that when it is color matched that they sometimes put too much yellow into it. Not sure if this is just made up or not, but it is a minor concern. I bought a bunch of samples from Samplize and plan to compare/contrast this weekend once they arrive. Thank you!