Warband 1 - 302
Gil Galad with shield
high elf warior with elven blade x5
kings guard with banner
kings guard with shield and spear x6

Warband 2 - 222
Cirdan
high elf with elven blade x6
high elf with elven bow and spear x6

Warband 3 - 199
Isildor with shield
Numenorian warrior with shield x5
Numenorian warior with shield and spear x6

Total 723pts
7 might, 37 models total, breaks at 18(I think)

My thinking was to have Isildor and Gil Galads warbands do most of the fighting. While using Cirdan to support and keeping his men as reserves. It was supposed to be a 750pt list so I have some points to work with but aside from more kings guard I don't know what to do with them. Thoughts?

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"Draw your sword with a heavy heart, but swing it with a heavy hand"

Give Gil-galad and Isildur mounts and give Isildur the ring, and drop Cirdan for someone who isn't pretty much the worst hero in the game for his points, like Erestor, a Captain, or even Gildor, who although normally I wouldn't recommend him, magic might be useful in a game this size.
Also, I'd drop the King's Guard upgrades and instead change most of the blade-elves into spear and shield ones for both the greater survivability and more flexibility. You shouldn't need that F6 too often anyway, as if the enemy chucks anything really massive at you, you've got Isildur who is effectively always at F11 with the ring on, and Gil-Galad, who is F9, so monsters and the like should be no problem as long as you can get your heroes into them, or transfix them with Gildor if you take him.

Anyway, hold the line with your infantry shieldwall and use your two powerhouses and archers to flank around the sides and smash them in the rear.

Thanks,
LordElrond.