I am not a big fan of these types of questions 
because cel collecting is such a subjective 
hobby. I paid $200 for the cel below. To some, 
that is an extraordinary amount of money to pay 
for a cel like that. To me, it was well worth it 
because this to me reflects the essence of the 
character and it a very beautiful cel. I would 
say that whatever you paid for it, it must have 
been worth it because you wouldn't have have gone 
out on that limb to get it if it wasn't. Don't 
let buyers remorse cause you to second guess your 
decisions. Enjoy, cause that Washu cel is great 
and in my opinion worth whatever you paid for it
(unless you paid $1000, then you're nuts ^_^)