By the way, Happy (belated) 20th Anniversary to the greatest TV series ever made (at least in my humble opinion), Buffy: The Vampire Slayer.
I actually liked Angel better but Buffy still started it all. You ever read any of the comics? I've heard they're really good.
Don't get me wrong, Angel had great moments, too. It's easily the second greatest TV series ever, after Buffy. Like you said, Buffy started it all, and I just loved the various aspects of the show (the high school metaphors, the funny dialogue, the strong female characters, the group dynamics, etc.). Funny that you should mention the spin-off series, because we needed Hercules first before we had Xena, and frankly, Xena to this day is held as being more culturally relevant than Hercules ever was.
I have skimmed through the Buffy "Seasons" comics, but I think the characters and their stories work best in filmed motion, not still art. However, I have read a comic book adaptation of the Buffy movie, which retconned said movie into the TV cannon. So that was a fun read.