I prefer two mirrors as well because I think it gives a more balanced look and it provides defined spaces, his and hers in our case. Your statement about wanting to make it so that 3 people can use it is what has me curious though, is this a what if type scenario or is a 3rd person actually going to be in there all the time? The reason I ask is because DH and I used to make choices based on the what if's a lot. We'd spend the money or compromise on what we really wanted only to never have those "what if's" materialize. We bought a crew cab truck so if we needed to we could tote people but never once did anyone sit back there. We turned a room (that could have been my craft room) in to a guest room and in 10 years it's only been used a handful of times and an air mattress would have worked just as well. So if you want the big mirror because it will actually be used in the context you're planning for, great...then there's a need and that would be the more functional choice for your situation, but if you're just thinking well maybe 3 people might need it, then don't focus on that and do what is more practical for your every day living. KWIM? (And Ida is right, about the two lights)

Some pictures would certainly help me give you an answer. But for some good bathroom lighting tips, check out this article: Expert Bath Lighting Tips

either do a whole wall framed mirror and mirror mount the sconces or get smaller mirrors. pendants in bathrooms are decorative IMO But do say you cant find any over the mirror that you like? there are have to be at least 800 choices, for example the one you like probably comes in a mutli head option. try kichler, hinkely, murray fiess, hudson valley lighting, minka lavery go to their actual websites and look through that way you will not be overwhelmed by say the vast amount on a lighting on line website.

Thanks! I did find a few that I think might work. I want to make sure the lights (shades all pointing down) have enough presence without overwhelming the mirror. I'm using polished nickel to coordinate with the warm beige/cream marble patterned shower/floor tiles that I am not replacing. The tub/toilet are linen by American Standard. Here are some lights that range from 16" to 19.5". My style is transitional. I'm using Kohler Bancroft PN faucets. The one large vanity mirror will be framed in walnut to match the new 60" walnut vanity (shaker style). The countertops are Caesarstone Dreamy Marfil (creamy beige with very little pattern). Do you have thoughts about white/opal/clear light shades? I tend to like clear, and am also not sure what "opal" means (throws off pink/yellow hues?). Thanks for your thoughts.