I can't stop watching TV series at the moment. I'm currently watching X Files, Star Trek Voyager, I have yet to watch Twin Peaks, and I am getting seriously tempted to re-watch Battlestar Galactica (new one) again.
My top 5 would have to be:
1. Battlestar Galactica
2. Star Trek: Voyager
3. X Files
4. The Tudors
5. Don't really have a fifth, if I had to pick.. Xena maybe?
I absolutely love Battlestar. I love how it takes a sci-fi setting and puts a very human face on it and it goes from a show about a war with the cylons, moving onto politics and the things we'd encounter if it actually happened, to religion. I think I've watched it about 4/5 times now. I think it has fantastic characters as well. My favourite is Six, but I also love characters like Starbuck and Saul Tigh because of the amount of character development they have.