I just made this list today for a game and am pretty pleased with it:

Gandalf the Grey
Damrod
16 Warriors of Minas Tirith with shield
16 Warriors of Minas Tirith with shield and spear
14 Rangers of Gondor
Eowyn with horse, armour, and shield
6 Riders of Rohan, 2 with throwing spears

55 Models, 16 Bows, 6 Might

What do you think? I know it's not ultra-competitive but I expect it could fare well in a low-key tournament. Plus it's reasonably thematic.

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"There are few left in Middle Earth like Aragorn, son of Arathorn." - Gandalf, Many Meetings

not bad, it doesnt have any major weaknesses. the only change i would make is to drop 1 guy and give some of the rangers spears