Really five go-to firms in the US that I would talk to as a startup: Cooley, Gunderson, Latham Watkins, Wilson Sonsini, Fenwick. All of them should have boilerplate agreements that they can help you with for low cost. They should also have some kind of "deal" for new startups that gives you some basic setup documents free and defers costs until you get financing.
More important question is to find the right partner/associate to work with. Your experience will depend more on who you work with than what firm. Ask for startup references from attorneys. Also, understand who will do the actual work for you -- law firms leverage associates so the chance that a partner will do work for you is low and if they do it will be super expensive.
Orrick is a great firm but from my experience they are better for companies that are later stage. My sense is you have a greater chance of finding a great startup attorney at one of the other firms.
More important question is to find the right partner/associate to work with. Your experience will depend more on who you work with than what firm. Ask for startup references from attorneys. Also, understand who will do the actual work for you -- law firms leverage associates so the chance that a partner will do work for you is low and if they do it will be super expensive.