I'd probably be looking at metal halides (3 or 4 bulbs) with T5 HO
supplementation. I think the 250 watt one would be okay. Metal halides by themselves are often too white and need a little blue to tone them down.
Another alternative I would consider are LEDs. They are very pricey but offer energy efficiency, long life, and the good ones you can customize the spectrum on. Here's a link to a review and experiment with one of the good ones: Mr. Saltwater Tank’s Radion LED Experiment
Mark Callahan actually has a series of videos documenting his trial of the unit.
If you are willing to lower your expecations a little, an 8 bulb T5HO set up isn't unreasonable either, and is the cheapest alternative in the short term as well as being a little cheaper to run than the halides.