Travel Idea needed

I am planning a driving trip from Orlando to NYC and back, in order to host my girlfriend's parents. The trip is going to take 7-10 days. My preliminary plan is:

Orlando, FL -> St. Augustine, FL -> Hilton Head Island, SC (stay one night) -> Asheville, NC (stay two nights) -> Alexandria, VA (stay two nights) -> Washington, DC -> New York, NY (while staying at Alexandria, since it is cheaper) -> Richmond, VA (stay one night) -> Charleston, SC(stay one night) -> Savannah, GA -> Orlando, FL

The plan is still rough, and it is going to change with budget. I have a really tight budget (<$2000).

I appreciate it if you give my some advice.