well...lets start with the obvious...TANK ($300ish)...your best bet would be to find a REEF READY one which has overflows built in, and this is to drain into an underneath area for a refugium/sump ($150ish)...if you can not get or do not have a reef ready tank, you can get hang over style things to get it down. then you need the pump to circulate the water from the tank to the sump ($50ish). The tank will need pretty good IN TANK circulation if it is to be a reef, 1000 gallons per hour or so extra and a couple koralia 3's ($40ish each) would work or some maxi jet 1200's ($40ish each) on a wave maker ($40ish). A must is a decent skimmer, and i currently use a coralife 125 ($150ish) on my 90, and it seems to work well, my friend has a das ex1 on his 110 which he likes ($300ish), up to you really. Then i would go ahead and get decent lights so you can be prepared for the reef, and some T5's ($300ish) would probably be best, but depends on what you want in your reef. A couple pounds of rock per gallon would be sufficient, so 100 lbs rock ($3-5 per lb) or so and 50 lbs or so sand. I would recommend getting a RO/DI water unit ($150ish) because it definately pays for itself in the long run. TWO heaters ($50ish), not just one because they will fail. Ummm...all rough guesses here, maybe a lil more maybe a lil less, but more or less your basics to get started. please ask questions and more questions, and welcome to the board, good luck!