We just did a kitchen reno, so here's my two cents, for what it is worth.
Go with black appliances. You have dark wood cabinetry, so the black will blend in. The white will stick out like a sore thumb. And white appliances don't look as modern as sleek black ones.
The window sills would be nice if they matched the baseboard. If your baseboard is white, then match it. In my HUMBLE opinion, your baseboards, door casings, and window trim usually all match. These are trims, and they usually are the same color. It should be consistent throughout the house.
However, in this case, if the baseboard and door trim and door are honey stained, and honey stained throughout the house, you might consider painting out the window trim in the sage OR staining the window trim honey-colored. You can mix wood stains, and a honey stain is pretty neutral.
Hope this helps!