Somebody below mentioned Tomoe in San Rafael for their Ramen. I have to second this. In an area full of crappy Japanese places that drown salad in mayo, have full menus of sushi without a single raw fish, and serve a cuisine I wouldn't recognize as "Japanese", Tomoe is a standout. Authentic in the good sense of the word, it's got a menu that wouldn't seem out of place hanging on the wall in Tokyo. The simple food is very typical, but also very flavorful.
The katsudon uses good cuts of pork and they leave the egg runny. They don't ladle on ridiculous oyster sauce or sweet and sour sauce like many local places do. The shogayaki is delicious, simple shaved beef grilled with ginger. They don't over-americanize it with extra grease, sugar, or too much ginger. The ramen is fantastic, a hearty soy sauce broth with two succulent slices of pork. A good ramen chef has spent a long time tweaking his recipe, and usually does a single one well. A menu with lots of different types of ramen is usually a sign that none of them are done well.
Anyways, this is my vote of support for this place.