Just to give you an idea of price from a different area of the country
has a 55 tank, stand and hood (plastic cover with two 15W florecent bulbs) for $239.00
45lbs of live rock if gotten local at lets say $5lb thats 225.00
If you get the rock online you should be able to do it for $3lb after shipping
65lbs of dry rock at lets say $2lb 130
marine basic test kit $25
Lets say you do a 3" dry sand bed with 1" of live sand on top. Dry sand $5 / 50lb bag. Need lets say 3 bags. $15
Live sand (estimate 30lbs at lets say $2/lb) $60
Lets price a 200gal salt bucket $55 (you wll use maybe 1/4th this bucket to start yoru tank but after doing water changes you will need all of the bucket.
submersible heater 150W 2X $30
maxijet 1200 2X (powerheads) $44
Wet/dry filter $200 (i dont like canister filters on salwater setups and if you ever venture into a reef you will be glad you made the investment in a sump (aka wet/dry) )
mag 700 return pump for wet/dry $60
If your not interested in light hungery creatures then the stock florecent bulbs might be ok.
A double tube florecent fixture is going to be $80 but you will also have to buy the glass covers for the tank *many of us run our tanks open and uncovered.
Upgrading the lights to a power compact solution would give you more light. You could go with a single bulb power compact fixture for $130 or a double bulb fixture for $240.
Aside from the tank most of these prices are based on prices found at www.petwarehouse.com