I have found myself a nice keyword for building an Amazon site. It has 3600 monthly searches and very low competition (9 in Keyword Revealer).
I am however in doubt about this keyword, because it has no buyer or commercial intent. It is just a product keyword, without 'best', 'buy', 'review', … For example: my keyword can be compared to 'tennis shoes' and not 'best tennis shoes'. My other pages could be things like 'Dunlop tennis shoes', 'Nike tennis shoes' and not 'best Dunlop…'….