^ This may seem odd, but I never watched DS9 either (just enough to know basically who the characters were, and some vague sense of The Dominion) and I picked up Avatar in the bookstore one day to discover that it started with a remarkably detailed timeline of everything in the show. Which was so cool, that I just kept reading, and got all the way through the first dozen or so relaunch books before I felt like it was even vaguely a problem that I'd never seen the show. What I'm saying is, you should read the DS9 relaunch anyway, because it's awesome. Or at least that you should consider it.
I'm working on it I'm actually watching it in a way I've never watched any other shows; I know most of the surprises, so watching it all in order produces a lot of anticlimaxes and useless buildup, so I'm picking the themes I love and watching them all in a row. Like, all the episodes about Odo's past. Then, all the episodes about Bashir's character development. Then, all the Mirror Universe episodes. Etc. Right now, I'm watching the Section 31 episodes. It's an interesting way to watch a large body of TV episodes; you pick up all sorts of thematic parallels and stuff. Good times, and I get to skip all the filler episodes, and the long run of episodes that slowly revealed more and more about the Dominion, since I know it all already.
Let's see: TOS: Cloak TNG: Vendetta DS9: Avatar VOY: Full Circle (I guess) ENT: None SCE: I'd say Interphase even after all these years. Vanguard: Harbinger Titan: Orion's Hounds Gorkon: Diplomatic Implausibility if it counted NF: Once Burned Stargazer: Oblivion MU: Sorrow of Empire Challenger: er, Challenger