Lots of good options, and I too like to keep an eye out for alternatives in the event that my needs change and I'm determined to keep riding. In the event that you choose a step-through and need to use a bike rack on your car, there are inexpensive bar adapters for this.
I love the versatility, utility and elegance of a mixte, and the Soma Buena Vista is particularly good looking example. I considered one for myself, but I ended up liking the feel of a mtb more.