Damn it's 20 years already... I recently watched the full show after more that 10 years and it was so good lol.
Probably my favorite show of all-time. Agree that season 5 is the best though. The thing I liked the most was the development of the relationship between Buffy and Dawn, you can really see how they create a bond with each other. Season 2 and 6 were also pretty good.