Choosing a research topic

Having met with both the principal and assistant principal at the elementary school where I teach to discuss possible action research plans, I've come to discover that there are far more potential topics than I could have ever imagined.  Each administrator had a different idea of what would most benefit our students.  I decided, at least tentatively, to go with the idea of the principal since her plan deals with addressing the needs of students in math.  We are going to focus on the students who may not normally get any additional enrichment on a regular basis.  Our lowest quartile students get daily remediation during block time and our highest quartile students receive enrichment during the final half hour of the school day.  However, not much is being done to help reinforce the skills of the middle 50%.  We have a percentage of our grades 3, 4, and 5 students who are barely scraping by with regards to their state assessment scores.  Failing this test could result in retention, so we want to ensure that these students are getting that little push they need to keep them from falling behind.  They have not been recognized as needing any further help because they don't fall into the lowest quartile category, but we feel that they could benefit from an interesting approach to learning and reinforcing basic math skills.  We'll shall see how it goes!