I stopped by the local aquarium store today to check some things out. I was pretty close to right on the pricing for a tank Jim. For one exactly like the one below its $2,455.00 for a 180 gallon setup. That includes everything; tank, stand, lights, etc., the only thing left would be the filter system you choose which for one like I would get is about $300. Other than that all you need is the saltwater, fish, and any corals you want for decoration. So pretty much ~ 3k - 3,500.00 which is what I guessed before. It certainly should give you more options for photography on certain items if you went this way.
I may end up with one like this yet before its over with.