oh boy maybe I can help here...~_~
there was a very nice hotohori at asylum not too 
long ago..for about 275 (correct me if Im wrong 
because I seemed to have had heart failure when I 
saw it and I try very hard not to remember the 
cels I missed when I was too broke to buy em)
  Nuriko when you can find him (nice sized and 
fairly in the shot) Can go 175 and up..and up 
**sigh** and up..
Tasuki is getting higher in price, The highest 
ive paid was 160..but Ive seen em as atomically 
high as 250 in a sequence that must be at least 
twenty or twenty five cels long..and chichiri 
without mask no da can break you at around 280 to 
300 na no daaaaaaa...
As for the "villains" it varies. Ive spent 
between 25-150 on ren cels that range from 
profile to pan (I Love Ren)
On ebay even a lousy cel can mysteriously be bid 
into a horror show..
It all depends on where you go. What your looking 
for and how much you are willing to pay. 
The best advice I have is look everywhere. Get a 
feel for what kind of shot your looking for and 
how much the dealers are selling them for.. dont 
be afraid to compare...The more cels you look at 
the better an idea youll get.
  The most important thing is to remember when it 
comes down to it, if you really like a cel, the 
question always goes from how much is it?  to 
jeez I hope noone else grabbed it first!!
Unless your broke at the moment..then you tell 
yourself..there are thousands of cels in that 
series you cant possibly collect the whole 
set..There will be another..there will be 
another..

Pale
who is desperately trying to tell herself that..