Be comfortable with #2 being your living situation much longer than expected!
Committing to #2 puts you in the awkward position of having to buy the land and setup Basecamp before you move out of your home. Depending on what you believe, you may extend your finances to that endeavor only to watch the market interest in your home fall (especially heading into winter).
Nothing is absolute, these are just the same issues I am currently weighing as I am already past the point of return. We just had a contract on our house fall apart 2 days before due diligence expired.
