My absolute dream cel would be from the last 
episode of Slayers Next, of the Lord of 
Nightmares herself. Unfortunately, I've only ever 
seen two of these, and the people will never give 
them up...but I can always dream! I'd also sell 
practically everything to get a cel from 
the "Toki Ni Ai Wa" scene from the Utena movie 
(unless of course that part was one of the 
digitally created ones, I don't know...), one of 
Folken showing his wings, one of Tasuki in drag 
from that bit after the OAVs, and a OP cel of Aya 
(preferably the one of him half naked ^_^). Good 
luck to us all!