I've gone to Yama for years. Their sushi is delicious, and their rolls are creatively named, which is a fun touch. I only give it four stars because we always end up waiting at least 30 minutes when we go. They've expanded by adding a second room, and it appears that they are working on opening a larger location; hopefully this resolves the issue.
I love that they have an all you can eat option. They have large rolls, and they all taste different. A lot of places serve the exact same roll and just switch around the order of the ingredients. At Yama, you get unique roll options. Our favorites are the No Name roll, the Wet Dream, and the Yo Sexy.