I certainly wouldn't mind a show with Faith as a main character! Though at the same time, while I normally hate it when characters are killed and immediately brought back (I dropped Farscape for a long while specifically because I knew they were going to pull this), I think Buffy's death is one of those that work, precisely because it's shown to be a huge deal; you don't just die and come back and everything's hunky dory.

she's great fun, and much better entertainment value than Connor.

Hell yes.