Sounds like you are familiar with West Seattle with both Jak's and La Rustica on your preferred list.
La Rustica is great--super atmosphere. Hang out with a glass of wine on the sidewalk if you need to wait for a table. Great view of the sound. Have the calamari if it is on the menu.

Jak's beats the Met Grill any day for steaks, unless you are in a suit taking other suits out for a business meal. I wish the Met would improve their veggies. Grey limp asparagus, ugh!

Both The Salt House and the Red Lion Inn in Cohasset have good lobster rolls.

There is a whole write up in Boston magazine about where to get the best lobster roll. G. Hook in Boston sounds like a best bet, since they are a lobster pound/suppplier.

I am looking to order traditional East Coast hot dog buns (top split) for the 4th of July. (Serving crab rolls, instead of lobster rolls) Anyone know where I can either find them in Seattle or order them online or by phone?

Thanks

Mashiko in West Seattle is very good--funky, fun atmosphere. The chef is young, very inventive, somewhat arrogant, but the fish is very fresh, portions large, and not too too expensive.

Saito's (on 2nd Ave) is AMAZING. I have yet to figure out why it isn't always bustling when I go, but they have the best fish ever.