What are the best law firms for startups today?

I recently formed an LLC* and now I need to set up an Operating Agreement. I want to preserve the ability to convert to a C Corp down the line, as recommended in another HN question, if I pursue VC funding.

Which law firms should I reach out to at this early stage to help create my Operating Agreement and advise on next steps? LegalZoom comes to mind, but I think the experience there is a little impersonal?

Thanks.

* An LLC was my only option for reasons I won't go into here.