I'll have to agree with Daveinz..... The URI VHO's are my favorite. I run 2 white and 2 blue atn.
There was a ReefCentral post a while back that compared all halides complete with color pictures, lumens, and spectrum reports. Maybe its still there.
As far as Halides..... If you need halides, I have a friends that has sold his tank but still has his hallides, ballast and sokets. Its a dual bulb system....but you can run a single also. If your interested I can give you his email. I dont know the specs or the cost...
GT