Which monster do you like the most in Heroes 5 at level 7?

Archangels and Titans. And a Necropolis dragon is useless; 5 archangels can easily defeat 10 ghost dragons.

No argument there, but how much does an archangel cost, and how much does a bone dragon cost? And in a Necropolis army, the dragon doesn't play a leading role; you could say it's the last of the level 7 creatures, but you can compensate with numbers, as is typical for the undead.