eclipse, you said? nothing for filtration. all eclipse taks come with the filter and light built into the hood. the filter is a biowheel. and carbon bag. not much more expensesm cept for plants, fish, and bottom.
Matt
sand, water (make sure it is saltwater), and live rock should do the trick on getting it up and running..
but seriously most of those units come with a filter and you don't really need anything else. you could look into getting a protien skimmer, a heater, and make sure the lights are good enough for what you are looking to do with the tank.