If I tell you any domain suggestion, someone can reg the domain before you do this. So, on the account of the fact, I'd recommend you to use domain suggestion TOOLS - they can be helpful!
I agree with SiberForum. Go to the most famous domain registrar's websites, they have domain suggestion tools that can help you.
You have much to learn. Any site can be a top 100... depends on your content and traffic.. not the domain name!