Welcome to Librarium Online!
School league rules, so 1-2 hq 0-1 elite 2-6 troops and either 0-1 heavy or fast attack.
Kid in the games club I run at school bought Eldar codex and some dark reapers, against my advice to get some troops.. so here's a bash at a list with them in..
w/ 10 dire avengers (exarch, dual catapults) in a plain wave serpent
5 dark reapers (exarch, crack shot)
Trying my hardest to get them to THINK about what they want from an army and he is very stand back and shoot, not ideal for eldar but hey its his dollar
Any advice greatly appreciated
I would actually drop the Rangers, in this instance, and pick up a squad of guardians, and give them a shuriken cannon. Mostly the same killy killy, but a bit more versitility in their firepower.