G`day Stew,
As a fellow windsurfer/kiter, I agree with Teabaggin. Starting on a twin-tip is easier to concentrate on kite control to a certain extent,
But coming from a windsurfing background, I doubt you would have much trouble with a directional board either.
One of my favourite boards in my quiver is an 'Airush Sector'.
Great little board for light winds and long downwinders, good in small waves too.
As you get more in to kiting you realise there are many more options available in boards compared to windsurfing.
But in saying that, I still love the stoke I get from windsurfing too!