which arduino for DMX shield

Hi,
i am looking at using an arduino and a tinker it dmx shield, (http://store.arduino.cc/eu/index.php?main_page=product_info&cPath=16_18&products_id=255)
can someone tell me which arduino is the smallest (physically) possible which you can mount the dmx shield onto?
Thanks
Josh

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do you no where i might find the pin outs? or a guide?
thanks
josh