My Faves
Personally, I prefer Apophis as the Number One Bad Guy. Although he started as a somewhat pantomime, cartoony bad-guy, he gradually became a very 3-D character with different levels and more of a better character. I think ultimately, he got better once he returned from the dead (and what a return! I still love that reveal at the end of "Jolinahr's Memories" where he takes off his helmet and say's "APOPHIS". Speaking of that, it sounded a lot like the sound guys turned up the volume on his voice so it was more dramatic. If you want to know what I'm talking about, watch the aforementioned scene and compare it to the replay of it in the next episode. They definitely sound different.). I also like the next few times we see him in "Serpent's Venom". He has a REALLY cool outfit along with several scantily-clad women gathering around him giving him "pleasure".
Anyway, besides Apophis, I also like Ba'al, Sokar and Anubis. I wish that Sokar hadn't been killed off, he REALLY was evil! Still, in a way they've brought him back with Anubis (David Palffy played both parts!).
Still, I don't like the way that the producers and writers sometimes just use the Goa'uld briefly. Apophis, Anubis and Cronus fell into this category. One episode just had Apophis' voice! If the writers are going to use the characters, they should use them more each episode!