Welcome to Librarium Online!
Ok, here is my army list for a little tournament.
autarch (jetbike, mandiblasters, laser lance, fusion gun)
4 fire dragons + exarch (flamer, crack shot, tank hunters)
Wave serpent (twin scatter lasers, spirit stones)
7 guardian jetbikes (2 shuriken cannons) + warlock (embolden, singing spear)
6 guardian jetbikes (2 shuriken cannons)
4 shining spears + exarch (starlance, withdraw, skilled rider)
i'm not sure about the wave serpent, maybe i'll change it for a falcon with holo fields and take a jetbike out.
the fire dragons, autarch and shining spears can take out some heavy armoured foes and tanks while the jetbikes can kill all infantry.
I would personally just run more firedragons over an exarch if they are hunting tanks and the like the extra shots make up for the skills you loose. I'd like a warlock in that second bike unit but not sure exactly where the points would come from, overall it seems like a decent list for the point range and fits the theme nicely. I would be concerned about the low model count but that is what you have to deal with for running bikes