Hey Dr Rob
I did a little googling of kiting in ecuador, seems conditions are much better than you have been led to believe, the word seems to be 18-25 knots in Manta year round!
kiteforum.com/viewtopic.php?f=1&t=3486www.humboldtkites.com/On the strength of which I would suggest a 9-11m ish SLE-hybrid-bow style of kite, again, google is your friend, look in the buy n sell and then look up reviews of that kite, and bear in mind that everyone thinks the best kite is the one that they fly.