There are a few cels I think this about- most of 
them are in Curt's gallery.  It's not lucky to 
share the same taste as a dealer.  :D  
He has an FY Opening  cel that I totally love, 2 
amazing cels of Yohko from ova 2 and 3 with sword 
that I have had dreams about, and a darn nice 
Asuka with background from evangelion.  :)
The only other cel I can think of that I would 
have liked to have more than just about any other 
is one that the owner of the site that was around 
for a few months and was the first selling AnC 
cels (why can't I think of the name of the place 
now? Anyway, they're no longer in business).  It 
was a cel I almost got from favorite anime cels, 
but somehow the seller had already sold it to 
this person or something happened, because I 
ordered it and it ended up with this person 
instead.  I wish I could post a pic of it, I 
think I still have one at home.  It was tamahome 
from second season in the lavendar outfit with 
gold collar, looking almost straight ahead...the 
nicest I've ever found and the saddest loss I've 
ever had cel collecting.