Duke Aiona would be the best-known person to run for Case's district, but he might not be intereted. Gov. Linda Lingle would certainly come under pressure to run.
In an unrelated developement, GOP Honolulu City Councilman Charles Djou is thinking of running against Congressman Neil Abercrombie.
It would ne nice to have an Asian-American Republican back in Congress again. The last one was Jay Kim from CA, and he, sadly, wasn't exactly an all-star. :-(