I would go with like a 15 or 17" Roadie frame. Maybe a Nishiki , Raleigh or something.
http://newjersey.craigslist.org/bik/92251932.html ----Not bad
http://newjersey.craigslist.org/bik/92251932.html ---Better
http://columbus.craigslist.org/bik/94457970.html ---Best one out of them...all ready for single speed