When do I need to get a crown, and how much should I pay?

I recently had a root canal and crown lenghtening done on a molar. My endodontist told me that after the dentist places a permanent filling in the tooth, I can potentially wait up to six months before getting a crown put on. Well, I saw my dentist the other day, and he told me that he wanted to do the filling and the crown together. Since he could still see my stiches from the crown lenghtening, he decided not to go ahead with the procedure. Instead, he replaced another crown that I had received from my previous dentist because he said it was too big. Even with insurance, I was charged $500 for this crown! I wasn't expecting that, and now I don't think I can afford the crown on the tooth I had came in to fix in the first place. I have two questions: Can I really wait six months to get the crown on that tooth? I think I'll have to now. And..are crowns really this expensive? I thought they were around $600 BEFORE insurance, but the dental assistant told me that they are 1000.
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