You dont want to know!
I actually haven't done much shopping yet. I am concentrating now on breaking ground so I have a place to put it. Because my husband is insisting on a big garage and the entire area above it will be my bedroom, the room will be 32 x 32. I was looking at the plans and we actually had when all was said and done a 16 x 16 area with nothing planned. I started thinking this would be an awesome place for a large tank that could be placed in middle and viewed from all 4 sides.
I did speak to one guy who gave me a ball park figure that included EVERYTHING! Stand, a protien skimmer for a 1000 gallon tank (we will need a big skimmer for sharks and rays) A custom built tank (the spillover is going in the middle), rock to go around and hide the spillover, the tank for the sump/fuge, sand, pumps, fittings, chiller, heater, everything. He said around $10,000 for everything I will need (this included trucking everything from california to montana)
I haven't done any other research. For one thing we build custom log furniture so I know I can take the satnd off that price. As we get closer to finishing the addition I will see how much money is left and then start to really price things. At first his quote sounded really high and I almost fell off my seat. But if I start thinking about what I have invested in my 120 setup it really isn't that bad. The difference is my 120 was a year in the making. I started building it over a year ago and added the chiller (my last addition) about two months ago. So I really dont know what I have invested, but it might not be so far off and it is a MUCH smaller system!
If you like I can keep you informed as I find out more... Maybe I'll start one of those threads and document my progress and setup!