Ya David has a great rep, some have had issue but I think thats the exception not the rule. He has various sources so he has a nice variety but when it comes to a fish its about the features that are important to you. Some will only buy double flowers, some wont touch them other will cut off they right arm for fish with a massive KOK others wont touch it.
Generally this is what your going to pay $$$ for
1) KOKsters
2) Pearling over the entire head
3) Thick pearling over body with vibrant coloring
4) Nice tight body with a short face
5) Wrapped Fins
If a fish has all the above its going to be top dollar missing one of the above then price will go down and so on. Look at fish find what you like and buy for what you like not what your going to get comments on.