I don't know your timeline, but if you keep your eyes open on all of the "local" reef club forums (NTRC, ETRC, MTRC, WTRC, and I know there's a Kentucky one I can't think of... or even an Alabama club maybe) you should be able to find a used tank pretty easily. More importantly, you can find great deals on rock, which is pretty hard to come by from LFS's for anything less than about 6-9 dollars/lb. Do the math to fill up a 90-120 gallon and that bill is more than I want to even think about. A lot of times, people getting out of the hobby are selling tanks with the rock... that's the way to go. If you are looking new, glass cages is supposed to have decent tanks at great prices. For big orders of live rock, I know a lot of people go for tampa bay saltwater. It's supposed to be real good stuff (just make sure you get out any of the nasty critters that are likely to come along with it... like mantis').