Where To Go For Good Beach Vacation On Atlantic Coast?

I want to rent a beach house – family of five, three kids ages 15-11. Looking for a nice beach (water not too cold) interesting surroundings, not too commercial, but not isolated either.
Can go anywhere from Cape Cod to Cape Hatteras, NC, and want to keep costs down.
Any suggestions? I know of Cape Cod, Rehoboth Beach, Ocean City, Va Beach and the Outer Banks. Which is best?

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