It's really mostly down to your own personal taste really. Henryanum is a beautiful small grower with lovely flowers. My personal taste is more towards the Franz Glanz, though. I also feel like that will give you a little more variety in terms of leaves, growing habit, and flowers.
I would go for the armeniacum x emersonii. It is very different from the esquirilli. It has mottled leaves and a different flower shape. I'm starting a paph collection too, and have chosen two very different paphs, a Rothchild like paph, and a white bulldog type.