At the moment I'm not just put off by the cost, I'm put off by the lack of suppliers in the Wellington area and the lack of income to support it. In addition to the $100ish/month just in salt, $600ish in equipment, etc.
I wouldn't put 2 KW of lighting over the tank though. Poor fish would go blind. Flourescent tubes are only a little dimmer, I think, than metal halides so I think 250 over my 200L would be far more than sufficient.