i loved all the speeches in this season, there wasn't one that i thought was redundant. but my faves are:
Xander's speech to Dawn in 'Potential'
Spike's traitors speech in 'Touched'
Spike's speech to Buffy in 'Touched'
Anya's speech to Andrew in, i think it was 'End of Days' when she tells him why she's fighting.
Andrew's speech to the camera in 'Storyteller'
Buffy/Andrew's speech in the basement in 'Storyteller'
Buffy's 'Are you ready to be strong?' speech in 'Chosen'
but my favorite has got to be Buffy's 'we just became an army' speech in 'Bring on the Night'. it still gives me goosebumps, even reading it!