I eat sushi pretty often and when I'm craving some, I default to Oiishi. I don't know of a better sushi joint for happy hour than Oiishi. Their $4, buy-one-get-one happy hour menu is pretty basic, but they make the food right. And the beer is amazingly cheap during happy hour. Aside from the happy hour, the all their other sushis are good too. I've gotten their combos pretty often and haven't been disappointed yet.
What I don't like? The parking lot is tiny, you'll probably have to wait to get seated, and the service is hit-or-miss.
Bottom-line: I'll be back for more!
Pros: Price, happy hour, good food, service
Cons: Parking, waiting, service