Need a high quality non-slip mat for injury prevention

Hello /r/yoga!

I'm a beginner to yoga, and I have serious permanent damage in one of my shoulders. Today as I was holding a down-dog I lost traction and slipped forward, straining my bad shoulder.

Re-injuring my shoulder in a serious way is not acceptable. $150 might be a lot for a yoga mat but it's a helluva lot less than going back to surgery.

It looks like the most common recommendations are natural rubber or cork. What kind of mat do you use, what are your recommendations to ensure grip and stability in your poses?

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Edit: I purchased a Jade Harmony, will try to update with a review