As far as I can tell the Silicon Valley offers value most to a very specific sort of start up. If you don't need to raise a lot of capital or require a large team of very gifted engineers (which probably requires a great deal of capital anyway), then I don't think the Valley is as valuable to you. That said, I think being connected to the important people in the industry may help your cause immensely. Perhaps spending the winter with YCombinator would accomplish that (as far as I can tell Mr. Graham is pretty important).
You also need to consider how much you value your home against the value you would bring your career. For me, moving away for a decade or two is a big deal.
No worries, I think there are a lot of good businesses that can be established by a few smart developers hacking away for a while, then launching and picking up angel funding as or if needed. I have a myriad schemes and I found that those criteria helped me cull the ten thousand to ten I am comfortable with and confident in.
It is easier to make a million dollars after a hundred thousand and a billion after a million. Don't get ahead of yourself.