Update: Grand Teton and Yellowstone have been really good to us.

So We been to the Grand Teton and Yellowstone National Parks over 3 times each now.... but they have been so worth while every time.
For example this.....

Elk Kill with a pair of Sister Wolves in Yellowstone- April

and this 

Family of Bears along the Snake River is Grand Teton- April

Last April the Greater Yellowstone area brought us a combined 6 Grizzly Bears, 2 Gray Wolves and countless members of the Cervidae family. Inside we're softies for Large predators so that visit made us ecstatic.