The Slayers
Slayers Next
Slayers Try
Slayers Movie Box
Azumanga Daioh
.hack//sign
Rah-Xephon
Record of Lodoss Wars: Chronicles of the Heroic Knight
Cardcaptor Sakura Season 1
Samurai X

I also have a good chunk of Rurouni Kenshin (almost equivalent of the first two box sets) and all of Fushigi Yuugi and Escaflowne, both of which are box set equivalents.