As great as Sarah is, I really thought (once her character was brought in more in S3) that Faith stole every episode she was in! I've never felt so bad for someone mourning the death of a villain as I did for her in 'This Year's Girl'.
It would be great to get Faith back, but it isn't like they're gonna let her win the fight against Buffy, so I kinda think "what's the point?". And it doesn't sound like Eliza's that keen to come back, but if anyone's heard different pleeeeeaase let me know!
All in all, Faith rocks!