I'm a sake novice, but if I were looking for a place to try more, the place I thought of is A-Plus. There selection on display looked impressive enough to me, and I remember they had some kind of infusions on the menu, which I hadn't seen before.
Fun venue to get sloshed in, and their sushi menu is pretty interesting as well.www.AplusDiningBar.com.tw
location: Anhe Rd. sec. 1 close to the Eslite