Leckie gets a lot of kids from Joint Base Anacostia-Bolling and it is more diverse and has higher test scores than many elementaries EOTR. However, there is a process pending to open a charter school that would give priority to military families. IF it happens, many kids would leave Leckie for that school. Leckie also had a sudden transition of principals recently but I don't know if that has been smooth or difficult.
Other DCPS you might want to look into: Nalle has Montessori and improving test scores, and like a PP I've heard good things about Beers.
A useful data tool is if you go to the "scorecard" section of a school's profile at
http://profiles.dcps.dc.gov/ under "student growth" you can see median growth percentile. An article about MGP is at
https://ggwash.org/view/31322/heres-the-dc-school-ranking-you-should-be-looking-at but it's old so make sure to get newer data from the school scorecards.
In terms of charters, DC Prep and KIPP have some of the highest test scores. The new Stokes (location as yet unannounced) will have a lot of interest from families WOTR and will have bilingual education. Two Rivers Young is not EOTR but is a good commute from some neighborhoods EOTR and seems to attract a mix of families--it also offers a path through middle school, if that's important to you.
There are no plans for magnet elementary or middle schools anywhere in the District. Ron Brown is a middle/high school for boys with some selection criteria but I don't know if that fits the definition of magnet.