Tank - $1,700
Stand/Canopy - $1,500
Lights - $1,400
AQ2 - $400
Skimmer - $650
Top-off - $175
Stream set-up - $1,500
Ca Reactor - $400
Sump - $400
Plumbing - $200
Live Rock - $800
Most of the above I got really good deals on (really a $950 skimmer, good deals on LR, saved $150 on my calcium reactor), some have been purchased, some are on order. But this is just the bare minimum. I looked at CL options but 3 Streams should be enough for me and the Streams didn't really cost much more. This doesn't include corals, fluidized reactors, salt, test kits, RO/DI, all the buckets and crap that need to be purchased, storage bins, additives, magnet cleaners, kent scrapers, cleaning supplies ... and host of other things to nickel & dime ya to death.
Then of course there is the electricity bill ... blink your eyes and it's time for another $250 for new bulbs and test kits ...
Not a cheap hobby!