My recent review of Slanted Door (short synopsis: nice service, unspectacular food) elicited a lot of feedback on Vietnamese restaurants in and around SF that do it better for cheaper. It seems like a topic that merits its own thread.
When I want to be blown away with quality Vietnamese dishes, here is where I go, with specific dishes, ranked from most hole-in-the-wall to least.
-Loi's in Sunset for pork bun
-Golden Flower, in between Chinatown and the Financial District, for pork bun with imperial rolls (#40) (with better than average veggies) and their great pho
-Turtle Tower on Larkin for pho ga
-Yummy Yummy in Inner Sunset for banh khot, bun cari ga, and crab dishes
-Bodega Bistro on Larkin for shaking beef and banh xeo