I started rewatching the series on YouTube when I first came back to Pokemon, which is around June 2006 (I actually kept the playlists XD). I remember takato and jephaisgod...The last episode in my playlist was added August 2006, so I must have finished the 1st series around then. I watched up until around Johto Journeys.
Its never as good online as on TV, so I've got up to around episode 70 on my DVDs, Go West, Young Meowth. And I got box 2 and 3 around 3 weeks ago haha.