I only need a table for two, so a small place is fine.
Sushi Muramoto on Midvale - http://www.sushimuramoto.com/
The lunch menu is the same as the dinner menu, but costs less. The downtown location gives you more food for lunch. And it's delicious!
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Check out Edo Japanese Restaurant on Park Street. Good simple Japanese food with mid to upscale experience.
Not sure about a good Japanese but try Lao Laan-Xang Restaurant. Awesome Laotian food just off the capitol.