I have been using the GoPlay theme as my primary theme for quite a while and have yet to be disappointed. GoPlay is now compatible for the BlackBerry 6 OS so those with 9700, 9650, 9780,9300 and 9330 Devices running BlackBerry 6 can now enjoy this theme as well.
Razor-sharp lines and clean, fluid movement is the key to making such a theme work well. You will notice the inherent complexity of everything available to you with the subtle movement of your trackball/trackpad. Elegant, graceful, swift and powerful. This is as close as it gets.