[boombatty]

The later wave DCIH are the only worth while figures to get as they have better proportions and more articulation in the ankles, wrists and in some cases upper thigh swivels.

The figures from the later waves include (and you need to check the pics when buying because many have an older version that does not have the same articulation/proportions):

Superman, Batman, Captain Atom, Capt. Atom Gold, Aquaman, Flash, Deathstroke, Mr. Terrific, Medusa Mask Psycho Pirate, Martain Manhunter, Monitor, Anti-Monitor (a great figure btw), Fire Bug, Parallax GL, Grenn Lantern, Booster Gold, Max Lord, and a bunch more.

The later DCIH are a bit smaller than MU so they don't match up as well but they are great figures none-the-less. As for the older DCIH waves, I would forget them unless you plan to use the heads for customs.