Just throwing links at you isn't the answer to your question.

A lot depends on the niche and whether your site has exclusive content, purchased, a mix of both, feeds, and how often you'll update. Is it photo or videos or both? Price you assign may well be reflected in what it's going to cost you to show the content. IE: bandwidth, production costs, feed rentals, etc.

What I consider a top selling site won't be the same answer from the next person that reads this post. We all market differently and have different surfer traffic that has different interests.

I suggest finding other paysites that are similiar to your niche, and carrying a similiar arrangement of content and update schedule and noting what they charge.