Protection from what? Liability to customers, business partners, and people affected by your business? Or liability to company members with equity claims?
I'd like to know more about what kind of legal threat an S corp is specifically better at protecting you against. Were you a C corp before, and had a company officer problem?
You mentioned taxes. Taxes are a huge difference between company structures. But you don't need a lawyer to sort that out; you need an accountant. And you probably don't need the accountant until you have significant or prolonged revenue. Either way, the tax problem with company structures is one that every freelancer has to deal with, and most of them don't spend $9k on legal fees to work it out.
[Edit]: Part of this conversation has gone offline into email, and without putting it on HN, I'll reiterate: get client/customer/partner contracts reviewed. Nobody should argue that you should skimp on contract review.