Earlier quoted context omitted.
Probably better to go with an LLC. In many states they are low cost and have few requirements, but still provide limits on liability and provide a professional image. If the startup becomes successful enough to need a corporate structure, then you can hire the lawyer and go the more expensive route.
I looked into this a while back and came to the conclusion I maybe/probably didn't need to do it upfront but it was cheap enough that it was probably worth going ahead and doing. As it turns out, my timeframes for doing anything with the business slid out but a don't really regret having put the LLC un place.
It seems like what Paul Graham called “playing house.” Forming an LLC feels like progress but it’s not.
http://www.paulgraham.com/before.html
What I mean is as I have been thinking about my opinion today I think my opinion comes from a deeper intuition developed over the years.
The standard arguments for forming an LLC are not based on better meeting the needs of actual or potential customers.
Even worse I think is that the standard argument is based on assumptions that the relationship is adversarial, arms length, and short term.
Good customer relations are way more valuable than limited liability because problems tend to be worked out before lawyers get involved.