Kung Thai is right off of IH30. You head East on 30 from Dallas, exit Goliad, turn left at the light, after going under the high way the restaurant will be on your left right next to Joe Willys. Try their Rockwall Roll!
I think one of the best places around the Addison/Plano area would have to be C-rolls off Preston and Frankfurt. Their prices are fair for the lunch special, and all their sushi is really fresh. It's one of our go to spots as as company.
My wife and I love going here. They are very friendly and have great rolls at a average price. I love a sushi place where once you walk in you are instantly greeted with a chorus of hellos from the sushi chefs.
Although I'm not from Dallas we have an office downtown and I ate at a rockin roll sushi that was awesome. Very friendly great atmosphere. Ill have to look up the address later and post it.
Yummi Sushi in Valley Ranch is the best. They even have a nightly special from 5-7 for all you can eat sushi for 21.99 with free Sake. It is super fresh and the chefs are awesome!!!