My wife and I got started on Who when the 1st season of the current series was first available on DVD. Got it on Netflix. We were instantly hooked, but then tabled it as there was nothing after that available to us yet. Recently I discovered seasons 2, 3, 4 and all of Torchwood so far on Netflix instant watch. We're in the middle of season 4 now. I've been watching some of the classic who's on Instant watch to get a fix when she's not around.
One of the best Classic Who serials is "The Caves Of Androzani". It's the 5th Doctor's final story. And it is amazing.
Ah. I started that one earlier this week. I got bored pretty quickly and did something else. I'll have to try again now that I know it's an important one.