Everything depends on what you want to have in your tank.
I'm going to tell you now that if you want corals or anemones you need expesive lighting. I bought a complete set-up for my 29g tank. This is what it cost me in Canadian funds:
Tank 100.00
Lighting hood and filter unit- Eclipse 3. Lighting holds 2- 24inc, 18watt fluorescent bulbs-200.00
30lb of sugar size sand gives me about an 1-1 1/2 inches of sand bottom- 45.00
heater-30.00
powerhead- 40.00
4 testers- Ph, nitrate, ammonia, salinity 50.00
my uncle built my tank stand- 50.00
50/50 actinic bulb 30.00
Coralife reefsun bulb 30.00
25lb of Live rock - 9.10/lb=227.50
RedSea salt- so far-160.00
RO/DI water- 5g jug=4.00
thermometer 2.00
I have not got any fish yet, that's the scary part!!!
I posted some pics of my tank. It's called "some pics and a pod question" in this forum. My user name is chamic. You can search for it.