It’s going to vary from niche to niche. My suggestion is just to move through the list, top to bottom. I’ve found for my copy a sweet spot with companies that do between 5 and 50 million in revenue, and usually have under 20 or 30 employees. They are small, but they have large revenues. So I know that I can make decisions quickly, they have the money to pay me and they understand the value of a good copy. Your criteria might be a little bit different and you may have to go through some trial and error.