Personally I think it's bad for resale, and at least would try for the double faucet, large sink solution, but I had a bit of trouble figuring exactly what your said...so I want to ask if there is a typo? You are currently "noT" trying to separate the shower and tub? Or you are "noW" trying and that's why you haven't the space? I ask this because I went from a master with just a tiny shower (less than 3' each way) to a master with both a shower (not huge, not small...3' x I think 5.5') and a tub, and I got two vanities out of the deal. I did this by using an unusual shaped tub, an Americh Japanese soaking tub. It's very tall, but only 40x40, so it allowed me the extra 34 or so inches I needed to give DH his own sink and cabinets. (Otherwise the poor man wasn't going to have a place to work in) :oP

My master bath re-do began with a double vanity / sink combo in the bedroom with a toilet and walk in shower in a separate room off to one side and a gigantic roman tub in a separate (but not closed off with a door) area to the other side. The vanity was one of those oak front particle board pieces of garbage with a cultured marble double sink and one of those gigantic mirrors overall. The walk in shower (which began the whole re-do) leaked underneath (inaccessible, of course) and into the kitchen below. So. Now I have a toilet and single wall sink with cart instead of vanity in the room where the toilet and walk in shower was. The roman tub (which was too big to be filled by our standard sized hot water heater) is replaced with a freestanding tub and shower combo (shower curtain all around) with easy-access plumbing (i.e. easy to spot leaks). In the center area that is part of the bedroom is just a freestanding mirror and a hanging plant under the skylight. Very minimal, clean, private. There is a little "ledge" under the free-standing floor mirror covering the plumbing that ran across the floor to the tub. This is reflected also by the ledge in the bathtub/shower area that was always there. It also prevents bashing into the unframed but beveled mirror with the vacuum cleaner. I know this is a lot to picture so I will try to come back with photos later. We are still doing some painting. It always seemed icky to me to have sinks in the bedroom and stupid to have a shower separate from the tub. Capping the lines from the double vanity and converting the shower plumbing to sink plumbing was fairly quick and easy (took a plumber less than an hour). I would suggest you hire a professional for the plumbing and do the rest of the job yourselves if you are wanting to go the diy route.

I prefer having the double sinks, myself. Have you considered not leaving all your stuff out? I hate for everyone to see my cosmetics, toothpaste, hairbush, etc. What I do is have great storage not only in the drawers but in the cupboards below, which are generally awkward. Target has those plastic Sterilite Drawers (which I hate out in the open) which make good storage out of sight under the cabinets. One is just for my hairdryer, wide tooth comb and brush. Another has make up, cotton balls, tooth paste, vitamins, everyday stuff basically. The drawers basically function the same as expensive pull out cupboards for about 7.00 each! The tops of the containers are not perfectly flat, but flat enough to store toilet paper. By keeping the majority of things below the vanity top is tame and functional. HTH.

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)