1000 give or take (with out fuge)
depends on what you want to do
my two foot cost me 100$
(heres whats in it, fluval 304,18wpc 50/50 actinic, 8w white light, small power head and about 10kg of rock with various corals that are doing really well even under that lighting, soon to be upgraded to 88wats in total)
i had everything except the pc light
(oh and 40$ for my homemade led moon light)
to increase the stability you can add a fuge (hence increasing the literage)
if starting from scratch for myself in my own home id do a bow front with in a cabinet type setup with a fuge the size of tank
with skimmer in it and heater and a dsb with some form of macro algae
250W mh and aquascape the heck out of it keep any coral you want have the looke of a really nice nano reef but not the size