I have recently taken on the challenge of purchasing a saltwater aquarium. Thus far it has been painful, expensive, frustrating, and somewhat rewarding so far. Currently, I have the following configuration:

Basics:
50 Gallon Glass Aquarium
60lbs of Live Rock
70lbs of Live Sand

Filtration:
CPR Bak-Pak protein skimmer that hangs on the Sump.
60lbs of Live rock, plus about 40lbs of rubble live rock in the Sump
I often use a 20 micron filter sock on the Sump

Coral:
3″ Colony Green Star Polyp (Pachyclavularia sp.)
4″ Colony Frogspawn Coral (Euphyllia divisia)
8″ Colony of Bubble Coral
Tons of Pink Xenia (Xenia sp.)
10 Polyps of Green Hairy Mushrooms
2 Heads (5″) of Green Torch
3 Colored Zoos
Tons of various mushrooms

Fish:
4x 1″ Green Chromis (Chromis viridis)
2″ Ocellaris Clownfish (Amphiprion ocellaris)
3″ Mandarin Dragonet Spotted (Synchiropus picturatus)
3″ Bicolor Blenny (Ecsenius bicolor)
3″ Orange Spotted Goby
1 Goby with Pistol Shrimp
4″ Niger Trigger
2″ Blue Hippo Tang

Inverts:
1 Pistol Shrimp w/ Goby
1 Skunk Cleaner Shrimp
1 Camelback Shrimp
1 Goregous Clam
1 Banished unsafe un ID’d crab in sump
Tons of reproducing snails

Fish
Full Tank Shot
Red and Green Zoonathids
Red and Green Zoonathids
Purple Clam
Purple Clam