Welcome Alice, first off, theres no real economy in this hobby, usualy its buy cheap, buy twice. You should continue your research and become more familiar with saltwater basics, theres plenty of fine, experienced people here who will be more than willing to help. The more information you absorb, the better. My initial question would be, what is your main intent with this new aquarium? What you plan to keep in the future will determan what kind of equipment youre going to need. Shredding through all the advice and technical data can be a real pain but anybody with a successful saltwater tank has gone through it. Have fun!