The light that is on my tank is a Coral life 96 watt 20 inch quad fixture.
As for cost of setup
Tank - $10
Live Sand - $20
Live Rock - 25-30 lbs $125
Light - $100
Fluval -$70 (used)
Various Corals - about $200
2 Clowns - $25 a piece
Purple firefish goby - $28
So about $600 for what i got. But just to set the tank up you would need Live Rock, Filter, Live Sand, and a heater. so that would run you about 200-300. So not really worth it. What i suggest is you look for a used tank. You can pick up complete 55 gallon setups sometimes for 300-400. Thats just my advice.
Thanks
Jake