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Why don't you guys pull an X-files and just list all the episodes worth watching. I'll get back to you in five years when I've watched them all.
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Off the top of my head I would personally recommend The Impossible Planet and The Satan Pit from NS 2 and Amy's Choice from NS 5. Those are the two plots I've seen that I've enjoyed the most. The finale of NS 5 with the Pandorica had a pretty strong first episode, but a much weaker second half.
I would also recommend the latest episode, The Angels Take Manhatten, primarily because I absolutely adore the villain plot in that and I can't believe time travel fiction has gone a hundred years without thinking it up before (Well, it might have but I haven't read it). The conclusion might be lost on you without the development of Amy and Rory though. It was even a little lost on me.