Laura,
I would like to suggest that at the outset, the business startup consider its basic strategy. That strategy will set the stage for business structure.
Why is this? First, what if the business is seeded with venture or angel funds and functions in stealth mode for the first six months or year prior to full scale production or marketing and sales? The business mission is part of that strategy. That mission sets the course for the company's reach into the marketplace and even the way it will do it. Will it be in manufacturing, retail, wholesale, services, etc.? Will it be international? What products or services will it offer the marketplace? The answer to these questions will play a large role in business structure. In many cases, a proprietorship would not be the best choice. LLC? Possibly. Again, depending on the products offered. A large number of services companies operate out of LLC formations. Sub-S? Perhaps. Numerous small independent gas and oil companies form as Sub-S corporations.
Second, how are similar businesses forming? I covered some of those issues above. One of the best indicators for a business formation is what other like business structures look like. Why? Most likely, you will be competing against them. Or they may be your vendors. Given this, business formation sets the stage for peer to peer business relations, and along with that arises a number of other issues - associations, liability, etc.
Third, consider growth strategies. If your strategy is to be a multi-million dollar business in three years, the sole proprietor may not be the place the start. You make a good point there about business liability. The larger a business become, the greater the liabilities it faces. The same holds true with aspirations of an IPO.
Consequently, there are a number of things to think through for a startup in terms of a business formation. The business plan or strategy will be one of the determiners for business formation.
