My sushi place is run by Koreans, they all speak English, Japanese, and Korean. You can get a spectacular meal for $50, and the fish is exceedingly fresh because the owner is a hardass about not compromising the fish quality. It does taste a bit different from Japanese places because they use California rice instead of bringing in expensive Japanese rice.
If you find yourself in MD, suburbs of DC, freepmail me if you want to try it. I won't post the name here, it is hard enough to get a table now.
The Korean's themself seem to just have one type of roll (maki) and they call it kimbob.