If you aren't moving, I'd ignore trends and get what looks good and works for you (since it'll be untrendy before it matters). In other words, I don't now what is trendy right now, so keep that in mind. This is just what I think would work and look good. :) I like what you have, with the mirror going almost all the way across. Leave enough space on the sides for hanging towels (retractable makeup mirror maybe?) so that they don't block the mirror. Possibly a wider light fixture than what you have pictured but at a similar height. I'd do a mirror with a small frame or beveled edge. (I think unframed mirrors are absolutely unpopular now, but your mirror is already sort of framed by the space and less might be better. A bulky googah frame could be overkill.) A medicine cabinet isn't necessary and won't be missed unless you like using the angles to see the back of your hair, but there are better ways of doing that. And a medicine cabinet over the sink would require multiple doors and a seamless look would be better.

rufinorox - Nice looking beveled glass cabinet. You should be very pleased with the overall update. We are in the beginnings of a facelift to our master and planning for a similar look by using a beveled mirror across a double vanity. The towel holder is simply a robe hook from the same collection as the towel bars. We found ours at Pottery Barn but most collections have something similar. Some even have really large ones termed "harness hooks" to use in lieu of towel bars.

The Potterybarn model was chrome. I think it was bigger than the Ali. I love the Robern cabinets and if you are looking for medicine cabinets, definitely look at them. I love the Robern base aluminum cabinets because they are light weight over wood or MDF. Good luck on your hunt!

you'd have much bigger problems with an overhead light when you opened your cabinet!!! I'd see whether (a) the cabinet can be fully or partially recessed, which will also give you more visual space. otherwise, (b) just get sconces that stand out from the wall enough to get past the cabinets. You might find that most wall sconces already do that -- even if it's partially blocked, most of the light will be coming forward and probably still be ok.