Just curious, going where? I though the whole US will get a nice view...
The whole US will see a partial eclipse; only a narrow band across the county will experience totality.
Within this band many things come into play, primarily weather and proximity to a good east-west highway for last-minute repositioning. Photographically, the sun's position in the sky and its altitude are important, as are foreground elements and local geography.
Taking all that into account, the area I'm focusing on is eastern Oregon, between the Cascades and the Idaho border.