I had a similar situation and I ended up not doing medicine cabinets at all. Medicine cabinets, in my view, seriously limit your flexibility. If you have any ability to build a tall, narrow cabinet somewhere else, you can just do a framed mirror and cut out holes for the sconces. I think that two is plenty for 60". It might be nice to put a soffit over and sink lights into the soffit to add some overhead light. You also might look at the pendant lights. Take a look at Robern's website. They have pretty cool cabinets that open up like a garage door. They show them with the pendants hanging in front.

i don't think they come in doubles, I am having no luck trying to paste the picture, it is similar to the dark vanity's sconces above, they are long and tubular. I will have to graph it out. Actually I think I will have to wait, because I have no idea where the bowls of the sink lie on this granite top. Ok, think I have solved my dilemma, I really need to wait for the granite top, not knowing the sink placement, and having one wall abutting the vanity. Then I shall attack it with graph paper.

I've had good luck finding them here before. Vanity lights or simple vanity lights Here's a couple that caught my attention, but you really should look around they have over 2200 to choose from. Bronze vanity light Nickel vanity light

Thank you for your response..I have 6" of wall space on each side from the edge of the vanity. I was thinking I will go with 20" even though I am yearning for 22". I want to go as high as possible for an 8' ceiling and 36" high vanity. Does 40" work? Too high and narrow? I cannot find any pictures. Just my freehand sketches...