I am also looking at 6'0
Hope to Try the SHINN Duke and a few others at Kitestock this week end!!!!
If the wind Blows!

details as listed on their website
* overview
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5"6” – Speed and Versatility
Designed for the widest range of conditions the 5"6” is the most popular in the range. Three fins to offer snappy turns and vertical off the lips. The 5"6” is a great option if you ride in a variety of conditions.
5"10” – Power and Style The most aggressive board in our range. It comes in tri or quad fin set-up, your choice. Only ¼” wider than the 5"6” the straighter outline in the tail of this board provides endless grip in the turn.
6"0” – Pure and simple The tri fin set up in the Duke range the 6"0” is for the purists. This board isn"t a fish but the increased width maintains your speed even when the wave isn"t perfect. Fully closed bottom turns, vertical off the lips and hard carving cutbacks come as standard.