Scott...
It is looking real good. Here are a couple of ideas/suggestions:
1. Put a 2x4 under your composite railing to stiffen it up some. If you put it in edge and center it under that decking board, it should keep deflection to a minimum.
2. I can't remember what you said you were going to use for balusters, but have you considered running a cable every 6 inches or so? It wouldn't infringe on the view at all and it would be a good bit cheaper than using wood.