Best Sci Fi Currently On Television?

A few months ago a friend recommended Farscape, and I started watching. The first season was flat, but the current season is absolutely amazing. So I started watching Lexx just because I had hope in TV sci fi. (I blame Voyager) I'll run a poll on this later, but I'd like to just throw this out: what is the best sci fi on TV? What do people like? Why? I like Farscape because the plot this season has been really interesting (and I even dig the device where the split the main char so they could have silly episodes interspersed with serious ones) and Lexx... well Lexx is just seriously bizarre: I love the wacky humor and terrible B effects. (thanks to everyone in Germany that recommended it. Wow! You werent kidding). Are there any other nuggets of joy out there that I'm missing? The scary thing is that the Sci-Fi channel has finally edged out Comedy Central and Cartoon Network on my Tivo for disk space.