Being in Seattle, you have the luxury of very large windows since the house does not need to be build for large snow load. Furthermore, there is many consideration in the construction of the windows that might be critical in snow area such as Michigan, Toronto or Québec... but just does not apply in the maritime climate.
In Seattle, the main considerations are "Rain" and "moss". Otherwise, any double pan windows is likely to be efficient for the climate.
On my Seattle house, I have PVC windows, some are very large (up to 118 in wide) and seems pretty trouble free so far.
I did not install them and I am not sure I will try to install a large 118 Inch windows myself. This weight a lot.
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