Bay Lo and Nha Trang, are two of my favorites.
At Bay Lo, I go for the miscellaneous salad, the goat rolls, and the Bay Lo 7 special.
At Nha Trang I go for the noodle soup with shrimp paste "in the shape of worms," the special summer rolls - you may have to ask- they will know which ones, the roast quail, and the minced clams.
I've been to every restaurant in Eden Center. If you like seafood, then Viet Star has a wide selection. Hai Duong makes the famous fish dish of cha ca thang long (Viet Star does it as well). Huong Viet has probably the biggest menu and the cooking there is very good (better than Viet Royal in my opinion). Both Rice Paper and Viet Star are more upscale. I also like Seaside Crab House.