CK - I like the scones you picked and if the photoshop Creative Visual Concepts, Kevin Strader did is accurate, they look like they fit well. As much as I like the honey gold finish, maybe you should think of using the same finish as your faucet. That will let the mirrors stand out more while still having elegant sconces.

Some options: This is a simple mirror "framed" with wood painted to blend into the wall. Any glass company can cut mirror to any size. That would accommodate the differing sizes you need. Then you can "frame" it with wood trim or leave it unframed. Here's one that has no frame, simply a sheet of mirror installed on the wall. I think that would work best for your application since you have two different sizes. This one has lights mounted over it like yours would. This one has the same treatment but not covering as much wall You said you wanted it to pop. If both the mirror and the light pop, then that's too much. I'd go with a plain mirror and get lighting that pops. The style of lighting would depend on what you like.

Moen 26" Tall Tilting Oval Mirror from the Glenshire Collection Model:DN2692BN ... remove the existing mirror and install this swivel mirror. Yes, it should be centered in your eye sightline. it will cover some of the window, but will look fine. I have done this in past homes for natural light.

If budget is a big concern I would look at painting the cabinet and replacing just the doors and drawer fronts and keeping the boxes. Wouldn't bother with the mirror. Get new lighting and new faucets. I didn't notice that the vanity in my master had an 6" space between the vanity and wall when I bought my home - I mean, I knew it was there, but didn't think about it, until I moved in. What a PITA. Awkward to clean and a magnet for makeup and hairbrush or toothpaste . . . everything seemed to drop into that little space and then my dog discovered the space - great place to shove her ball and then bark at it until I would retrieve the ball. It was the first thing I renovated in my home. Other thoughts really depend on your plumbing and needs. My home was built in the 1960s and was a luxury 2000 sf, 2 bedroom, 2 bath home in it's day, but styles have changed since then. I love my hall bath. It has an 8' vanity with just a single sink in the center. I love the luxurious look of this massive expanse of counter space and it provides ample storage. My master vanity is not as large and again, just has one sink. It was a 48" vanity with a 24 center and 2 12" banks of drawers with the 6" space between the wall and the vanity. The plumbing on that wall is really hard to access or change, so I kept the sink where it was and just changed the vanity to a 15" bank, 24" center and a 12" bank and added a filler piece against the wall. Couldn't do 18" drawers or the drawers wouldn't open due to hitting the door trim. I had to replace both mirrors and they were glued to the walls. We were able to remove the mirror in the front bathroom and fix the drywall, but the master wasn't budging. We ended up cutting the drywall to remove the mirror and just replaced the whole section of drywall over the vanity. Having single sinks instead of giving up drawer and counter space is not a bad tradeoff. You spend only a few minutes at the sink brushing your teeth and washing your face and much more time standing in front of the mirror doing hair and makeup.