It appears only the MH fans have answered this post.
I run VHO's over mine and replace them about as often as these guys repalce thier MH's. If you do a search of the Internet you can find articles on the differences between MH and VHO's. These articles will tell you how much each costs to setup and run. Then decide what kind of corals you want to keep and buy for them. Typically however, you are looking at a minimun of 4 watts of power per gallon just to keep most corals.
Larry