I bought a used fixture, 4' long, 2X250W, 4X65 watt CF, 16 blue moonlight LED's for $280.
I redid a few of the connections that had corroded and replaced the boots for the lamps, and its great and was a great price.
I like the halides. If you end up with 150W Double ended MH bulbs, I have 2 of them that I misordered and couldn't return. Yours for $20 each if you want them. Ebay quality (won't last as long before the spectrum changes), but they're cheap. 10k lamps.
Anyway, keep an eye on the used equip forums, and you might be able to get a good deal on a fixture.