HEY,
i wud suggest to tht the best time to take ur exams mostly depends on which coast do u intend to study.
Most of west coast schools( CA) has their application cycle from may-sept(do check ADA AND INDIVIDUAL WEB PAGES) and on the East coast they start in aug n go upto feb or so..
so if u take ur exams by june-july u can catch up on both.
incase u still target the next yr 2007, u cud put in hard work of 1-2 mnth , take ur exam ,get a great score n still try for few by feb -march.
GOOD LUCK
PS...correct me if im wrong about this, n do check ada for exact dates