The best mids I have thrown are a Z Comet, a ESP Buzz, a Dx Roc, a Prodigy 400s Proto PA4 and a 300s M4. The most used disc in a round currently is my PA4, but any one of these discs will do in a pinch. What I believe to be the most important traits of a go to midrange is versatility, and dependability. All of the above discs mentioned fly different, have different stabilities(I don't really know this, I assume there's variance), yet they are all versatile and dependable. Don't pigeon hole yourself by trying only one manufacturer, try as many as you can afford is my advice, (says the guy who carries an all Prodigy bag).