I've used Willamette in a stout before and it tasted great.
I too bought a pound of US Goldings at 4.5% AA. The vendor implied they were UK Goldings by calling them "Kent Goldings" and listing them in their "Imported Hops" section on the website. They even say "Kent Goldings" on the package, but also state "Product of USA" (in this case, I don't think they should call them "Kent Goldings"). When using Goldings, I've only used real EKG to this point, but just brewed a Bitter on Friday with the US Goldings. We'll see how it turns out. I've heard others say that if EKG are a "10", US Goldings are an "8".