I think the new JP wide body SUP's make a cracking learner board.
I have the 9'9" with the centre fin (297 long x 81 wide, 157Ltr)
There is also a full soft deck version.
I have now taught 3 people to windsurf on one of these boards.
As a bonus, you get a SUP and an amazing light wind wave board as well.
http://www.jp-australia.com/2011/index.php?id=797Try doing that with an x-cite ride or go/start.