Not sure what your score will be, depends how long ago that 30 day late was, but congratulations on crossing over 700 and continue to move in a positive direction. Your credit score is a direct reflection of your patience and discipline, good luck!!
Have you ever tried to goodwill the late? If that is your only derog, I would concentrate my efforts on getting that removed.
Congrats!!! 1984....The year I graced this planet with my presence!