I don't understand how a button down collar wouldn't suit you. They are all I wear, casually at least, and I have many of them. I recently bought a few from a GAP's "modern oxford" line and was really impressed by the quality for the price.
What is it about the button-down you don't like?
In answer to your question, I'm sure Zara do some nice plain oxfords without the button-down collars.