Are you doing this for resale? Or for you? Since you really like the setup you have, I'd stick with it, and make it the nicest version you feel comfortable paying for.

I had the same problem. Since my vanity was good quality, in good condition, I decided to keep it and paint it. That is always an option. You could get new doors and drawer fronts and paint those to match the box if you don't like the current doors/drawers.

If you like light colors, then an off-white that matches the floor tile would be fine. Some grays would also work. There is a chance for a taupe if there is much of it in the floor tile and you can find one to match. If you like dark wood, black walnut looks great with gray.

I have a similar closet in my 1950’s home. It the only bathroom that is still original. The closet has a push touch to open and close. Yes it can bang into the door if the main door is half open. Not an issue if the main door is either open or closed. Start another thread with a floor plan. How can we offer suggestions if we don’t know dimensions?