Think about it this way, when your subs won't show up on time which inevitably will cause project delays, can you afford to lose a few months, not weeks, months, on your construction to save $150k? It'll be totally doable, just really painful. Some things people don't consider when GC'ing their own project...
1. Can you schedule subs in the correct sequential order?
2. When subs don't show, can you find the backups quickly and then in turn schedule all other trades around the change?
3. Are you willing to handle the massive amount of contracts / paperwork that come from hiring 10 different trades?
4. Are you going to verify all of their licenses? Insurance?
This is all totally subjective, but saving $150k for you to put $150k of time in, are you losing time / money elsewhere in your life? Just some things to ponder.
The other thing to consider is the San Jose building department. Are you familiar with the department? Their inspectors? I don't know much about their inspectors, but I'll tell you what I'm familiar with. The San Jose building department is the single most difficult department to work with....in the Country. I've dealt with building departments in 10 different states, my structural engineer in all 50. They are the most strict, unwavering, and unforgiving we've ever seen. Every time a project comes up for us in San Jose, our entire engineering team says no, flat out. Doesn't even matter what it is. Just keep that in mind.