I'd be in for a set below $50USD, I'd expect to see doubleshot PBT
(ABS would be acceptable), backlit compatible.
(P.S. I think everyone would rejoice if the double legends were placed higher on the keys with double legends to we get better illumination. See the top row keys in this pic http://i.imgur.com/0WGkf8H.jpg)
I would want the font to be unchanged from the current one, but it would be cool to see a corsair sails logo for the windows key :) hint hint. Different color keysets would appeal to more people, but if not I would prefer Black/white (translucent) legends.