Take what you think is the best job. Treat your old employer nicely, but you are not their slave. The only reason I see that you would stay put is if you want

Take what you think is the best job. Treat your old employer nicely, but you are not their slave. The only reason I see that you would stay put is if you want to relocate to SF (you'll need the visa). If that's not a major goal for you, then take the new job. If you relocate to SF, be aware that it will be a life-changing event, and you will be exposed to many more high-paying jobs in really cool companies. Either way, you won't be with your current employer for much longer, so don't worry about loyalty. Again, just treat everyone professionally.