My 'plan' is currently for a 72x30x30 room divider, ~280 gallons. I've priced out my initial setup at around $9000 - including pumps, plumbing, lighting, RO/DI, and lots of the miscellaneous stuff (salt, test kits, QT). However, that's still before the first drop of water goes in there. And I'm sure I'm missing a few things - the inevitable chiller, a calcium reactor if/when the kalk reactor isn't enough. Start adding live rock, coral, and fish and I should hit $12-13000 in no time.