I can tell you what we have in our house. All the windows have stained trim (in a honey color--maybe the one you don't like in yours? But I love it!) Anyway, the windows were all replaced by the PO, who installed and stained the new ones. The rest of the house trim and baseboards, however, are still original to the house (1939) and are all painted white. The doors, also mostly original, are painted white as well. The only new (french) door we added as part of an addition, we stained to match the window woodwork--that is the only door with stained trim. In our house, I think the combination works well. We have a lot of wood furnishings, as well as the floors, that are a similar tone to the window trim, and the white works well with our cottage/country-ish decorating style. We have talked about painting the windows, but my DH is against it because once you start repainting windows (which eventually needs to happen), it starts affecting how well they function (as we have experienced in other older homes we have lived in) How well it would work for you might depend on what color your doors are, what color floors/carpet are and how those blend/contrast with the stain or paint color.

I like baseboards larger than door and window casings. On door casings, I like your idea of same design/different width casings. Except maintain consistency like all doors in the old part of the house have the same narrower width casing. You don't want to look down a hallway, for example, and see different width casings on some than on others.

I like the way this house is finished with simple cove crown molding. I like that the molding is white, but the door is stained wood. Where the ceiling is slanted they omitted the crown molding; much cleaner look for that area. The base molding is quite generous.

Virgil and Joy, thank you so much for your input, for the informative link, and most of all for reassuring me that white baseboard and casings can be used. From Joy’s link, this home with the floating stairs (we will have 4” white oak threads with black stringer) resembles the modern home we are building. If 6” baseboards are used, then door casing should be 3” or is there another dimension recommended for a modern look? Not certain what is used in this photo.