Nothing to be sorry for. It wasn't a mis-post. I just wanted you to know that I don't have much knowledge in that area.I have talked to physicians who use Practice Fusion and they are happy with it as well. It really depends on what the provider needs. Your questions scared me because you asked for "top 5" and I don't know enough about the many systems out there to give advise on the "top 5".
For the docs that I bill for that have an EMR, they all use Practice Fusion. One is an IM doc, the other two are podiatrists. It is cloud based, it is free, and they are all very happy with it.