If you think you might get into corals I would go with something like this
TEK fixture is a 4 bulb fixture
http://www.marinedepot.com/ps_ViewIt...ct~SL2113.html
Or upgrade to the
Nova Extreme Pro but they only have a 6 bulb fixture that I see. Not sure if it would be to wide for the tank though. I didn't see dimensions there.
http://www.marinedepot.com/ps_ViewIt...or~~tab~0.html
For a fish only with live rock, you just need aenough light to view the fish. A normal strip light would provide that. After that it is preference on how much light you want, do you want the shimmer effect associated with metal halides?