My thoughts lead to the upcoming 5DsR, if you have the money. The 50MP will yield fine detail for landscapes should you want to print large. For web presentation, 50MP would be overkill. You can shoot in 1.6x crop mode and have 19.6MP, which would be very similar to the 20MP 7DII. I do not know what frame rate and buffer you'd have in crop mode though for bif.

If $3900 is a concern, then the 7d2 and T6i are more affordable options. If you anticipate significant bird in flight shooting, then the 7d2 may be the best choice due to frame rate.

If you have interest, here is some info of Dynamic range vs ISO for various cameras
http://home.comcast.net/~NikonD70/Charts/PDR.htm