I have both. I love the articulating screen on the 60D. But, the 7D is twice the body – almost literally. It has two processors, one dedicated for focusing and it shows in performance. When you have to get that shot, you want a body that will lock in NOW. The 60D is good, but the 7D is that much better. Focus speed, AI Servo tracking, and single-point focus with expansion that can be moved around the frame. The spot focus is an added plus for large aperture lenses. (Did I forget to mention the incredible 8 fps burst mode?)
While there are times when the articulating screen of the 60D comes in handy, my 7D is always my first choice. I got mine through Canon's refurb store and highly recommend this path. They recently offered a sale with the 7D for less than $1100. But, even at $1300, it's a good price.