I've bought themes from Theme Canon before and the main thing that stood out was their support and theme quality. They have some of the best tutorials, documentation, and info on their themes. Mike Moloney
Very well put together theme interface for designing and it loads very fast without glitching. I really enjoy working within this theme because it responds well to what I'm trying to put together. AEVMediaGroup
Display a category of trending posts either by most views or by most comments. It's a great way to showcase what hot in your blog.