If you need the reach of 400mm, the 70-200 II + 2xII/III will rival the IQ of the 100-400mm (slightly lower in the lab, probably not different in the real world). The 70-200 + TC combo is also weather sealed, likely relevant in the PNW.
If you need the reach of 400mm, the 70-200 II + 2xII/III will rival the IQ of the 100-400mm (slightly lower in the lab, probably not different in the real world). The 70-200 + TC combo is also weather sealed, likely relevant in the PNW.