A lot can change in two years, really, with both your professional and residential preferences. You may really enjoy your job now but something else might turn up that you'd really like to pursue, and leases are one of the few ironclad agreements out there that you wouldn't be worth your money to break. But also, if you're new to the area, you might find that you'd rather live in another neighborhood of SF. I would check around at Nabewise (Nabewise.com) to see if your chosen nabe is actually an area that suits your lifestyle and budget costs!