There's nothing to keep you from observing standard corporate formalities with an LLC, which may be a good idea with what you have in mind. However, with an LLC you are not REQUIRED to do so as a matter of law.
In my opinion, the only time a C corp is better than an LLC taxed as a C corp is if the entity plans to go public. In that case, you'll need to be able to quickly buy and sell ownership interests. Corporations are good for this; LLC's are not.
Also, a little known fact is that an LLC can file IRS form 8832 to elect C corp taxation, and THEN elect S corp taxation by filing form 2553. This means the S corp is more or less obsolete.
W. Ryan Fowler