Yes, I love BtVS, but have still to see Angel! I love the series, for more reasons than I can list. A great story, good characters you can love and hate ... and James Marsters!
The first series I truly loved was Blakes 7 ... the first TV series I became involved in fandom with. Reading a bit of fan-fic, as well as joining the fan club.
Avon, is my favourite character ... and maybe you can see why -
Other series I love are -
Star Trek, Voyager
As well as some mini series, such as Wish Me Luck, Danger UXB,