I was always thinking when RocketTheme will start developing WordPress themes as they are so innovative in there themes that you will not find such theme anywhere else.
There are few WordPress Themes in there portfolio and one free WordPress theme. There free WordPress theme Afterburner is fastest WordPress theme with 8 preset styles and 14 widget positions.
SEF Optimised Layout
Advanced Colour Selection
Suckerfish Dropdown Menu
8 Preset Styles – Light / Dark Variations
14 Widget Positions
FF3.5, Opera 9.6, Safari 4, IE6,7,8 Compatible
W3C XHTML 1.0 Transitional. W3C CSS 3 Valid