Hey...I dealt with this same problem, although perhaps for me it was even tougher than for you. I actually took a semester off (it was part voluntary, part "strongly recommended" by my university). If you notice, if you take any time off, almost every school demands an explanation, so I was put in a tough position. What I ended up doing was writing a PS that was completely about other things (mostly other personal experiences and how they related to what I wanted to study in the law), and then I submitted a completely separate statement about my depression stuff. (Like you mention in your post as a possibility). It seemed to me like the perfect compromise. That way, I got to write my PS about what I wanted like any other candidate, and I had a place to explain GPA issues. I also made a conscious decision about how far I would go in terms of "disclosure" in the other statement. I only told them what I was comfortable sharing. I think that was the best way for me personally to go about it. The only thing I can say is that it is totally your decision not even to mention it if you don't want to...but if it really hit your GPA, you'll need SOMETHING.