Here is a list:
Inverts:
Electric Flam Scallop
Tuxedo urchins are reef safe and are pretty sweet and they come in many colors.
Serpent stars
Brittle stars
Clams such as maximas and such if you have strong enough lighting.
Harlequin Shrimp and Zebra Shrimp (they eat star fish, so you'll need a constant supply of live star fish.)
Anemone and anemone crabs and shrimp if you the right lighting for them.
Fish:
Orbiculate Batfish (Not sure if they are reef safe)
Valentini Puffer are known to be reef safe.
Yellow Foxface
Decorated Rabbitfish
Magnificent Foxface (they are pretty expensive)
Dwarf Lionfish (might eat shrimp)
Achilles Tang (pretty expensive)
Christmas Wrasse (monitor with inverts)
Harlequin Tusk (pricey and might not fit in the 75 gallon, not sure)
Leopard Wrasse (I think they need very deep sand beds that are 5-6 inches deep.
Garden eels (they need very deep sand beds, about 8-12 inches deep)
Mystery Wrasse (pretty pricey)
Sunset Wrasse (not inverts safe)
Velvet Fairy Wrasse (they are reef and invert safe and they are really pretty but pricey)
Flame angel (50/50 with corals)
Corals:
Acanes
rare zoas