Burger stop is good.
JB Burger is good (though they have been pulling the classic TW restaurant downhill slide lately with cleanliness and presentation of food slipping markedly).
Diner's burger is still good.
Friday's has the best burger of that breed of restaurant.
and in Fastfood, Mackkers double cheeseburger and BK's Whopper still rule and tie for fifth.
Honorable mention goes to California Grill, KGB (never been there, but it gets a lot of positive press so perhaps it will rank when I do venture down there), An Burger, Evan Burger and that new joint on YiShen Lu near Zhongxiao (haven't hit you yet so you better not disappoint me having given you premature honorable mention status and what not).