You can get all that quietness in a $15 Agfa Silette/Solina. Ok, so the optical quality won't make you think Sumicron, but street is, as Colin said, mostly zone pre-focus and everybody is moving and jostling and so that 3-element Apotar will get you the picture as well as anything else. And if something should happen to your camera - hey, you are out the price of a Seattle cup of coffee.