I always found Amends a little strange...I dunno why. I guess it's because it dealt with things that they never addressed again until season 7 (but I didn't know about season 7 when I first saw it).
Surprise and Innocence are good episodes, but since I'm not a huge B/A shipper, they're not anything spectacular to me. I prefer What's My Line pts 1&2....dunno why...just, more stuff going on I guess.
The Body--where do I begin? It's a difficult episode to watch, but also very compelling, and so I usually find that I can't turn it off.
The Gift--I saw this episode for the first time during season 6 (started watching Buffy during season 6), so I think a lot of the impact was lost for me....yes, she dies, and her speech at the end was compelling, but it's not like she's GONE gone. It's not like, oh, New Moon Rising for example, where someone left for good, never to be seen again. ::crying:: ::crying:: Or (So Allycat doesn't think I'm playing favorites) Seeing Red where Tara dies and is really gone.