I don't care much for 1, 2, 3, & 4, so no advice in that area, but if you like Sabrina, you may like Charmed and/or other cutesy stuff like Hannah Montana, The Secret World of Alex Mack, Blake Holsey High, and Veronica Mars.
Buffy the Vampire Slayer is my favorite show, but no Buffy collection of DVDs is complete unless you buy the Angel series, as well. The first couple of seasons have several cross-overs and some characters reappear in Angel. You'll love all the inside jokes and get a kick out of seeing where the characters go from there. If you love what Joss Whedon (Buffy's creator) diod there, you should try seeing Firefly and the movie finale, Serenity.
Other than those suggestions, I suggest Dark Angel, Wonderfalls, Medium, Ghost Whisperer, and Monk, off the top of my head. I also love Andromeda. Enjoy!