I think litestep is the best because you can do anything with it. The community is strong, there is a lot of input into development of themes and third party modules, but the main thing is its flexibility.

If I want a theme that looks like a jet-fighter cockpit, so be it. If I want my desktop to look like a big pasture that gives me different things when I click on the different cows, well I can do that too. If I want a naked chick sprawled across the desktop that allows me to intera... well, let me just stop there.

Another thing: if I see a cool fake computer interface in a computer movie, I know that it was done on litestep. And if it wasn't, I could make it.

Yeah. Where do YOU want to go today?