If you want to host a Lizzeh fest, be sure, oh so very much be sure to prod irony_rocks. She writes awesome Lizzeh-John fic. (You should go read her latest fic, because I was in tears it was such an awesome fix-it!)

And my vote - FARSCAPE! It's wacky, psychadellic and crazy, but fun. :)

Then, SGA. BSG - eh, not so much, unless you go for classic BSG, which is still a fave show of mine.