FYI, you don't need to pay $3k - I lived in the Mission / Potrero Hill area (with roommates, mind you) for a few years, and my rent had always been between $1000-1850/mo.
Centrally located, safe(-ish), and beautiful. You can run through Bernal Heights Park, get ice cream at Humphrey Slocombe, and bike to the 24 Hour Fitness on 16th and Potrero. If you're in tech, you can definitely live well in SF :)