Rob, hope all is still well with you. From what I have been told and read, the ATI fixtures (available at reef geek) are the cat's meow as far as pre-assembled fixtures. These are pretty expensive, but are probably pretty close to the top of the line fixture available.
Several people also have the TEK fixtures, and have very good luck with them. I would check both, and decide from there. But reef geek is a good place to start.
Whatever you do, I would suggest to sticking to all ATI brand lamps. Even though UVL and other manufacturers make some great lamps (I am using several ATI and UVLs in combo) Jin has told me that ATI seems to have a much more blue/white spectrum set than the UVLs which seem more pink. I can attest to this, as my tank definatly has a pink look to it, and Jin's tank has an incredibly perfect spectrum IMO. Just something to keep in mind, because even though you can do some switching to perfect the colors, the lamps are not cheap enough to just buy spares to keep on hand..
Let me know if you are gonna order anything from reefgeeks. I am needing some more lamps, and several other people may need them too, so we can arrange a group buy to minimize or eliminate shipping charges all together.