Any advice?
You might want to have something in place (S-Corp or LLC) before your Kickstarter launches.
You can be sued for any number of things other than the obvious. If your product is significantly delayed and you don't deliver on time (been there), you can be personally liable if you don't have a structure in place.
Also note that an LLC itself isn't enough to protect you. We did the whole legal zoom thing and one day a lawyer asked us about our operating agreement. Naturally, we responded with "Whatchu talkin' bout, Willis?". She informed us that an LLC without an operating agreement isn't really a legitimate entity and won't pass the "corporate veil" test if anything should go down.
TL/DR: Talk to a startup lawyer.
It takes a lot of reading. I did most of my research on the web, and probably read ~500 pages worth of text before I figured out what I was doing.
That $350 is insurance against all sorts of bad things, and is, in my opinion, totally worth it.
Priceless advice. Protecting your personal liability should be of great concern, especially if you have a family/partner whose financial life is linked to yours.