I found this article today that goes into a lot of depth on how to properly secure SSH. It is definitely worth a read.
What is good about this article is that it covers all the various Cipher Suites available to SSH and which are secure and how to disable those that are of lower quality.
One thing to note. This article was written on 4th January 2015. This is great for now, but be aware that in 1 year, 6 months or even next week, things could have changed.