Summarizing a table from DGB (Daniels), Hops used in NHC Second Round Porters
Two most popular hops by use:
Bittering: N. Brewer, Goldings
Flavor: Cascade, Goldings
Aroma: Fuggle, and a tie between quite a few others including: Goldings, Willamette, Cascade....
Only two uses of dry hopping total and they used Goldings and Saaz.