You have a ton of room, and from the sound of it, a very large budget. If that was me personally, I'd buy an hid fixture, and led fixture, and a flouro fixture. Then run a full cycle under each. Maybe you will like the led best, but find a flaw in the particular light you bought. That would allow you outfit the whole room as you see fit, based on your own experience. Without having to do it twice.
Here is what I can tell you based on my experience. If you go with hid and outfit your room at 50 watts sq/ft, you better have darn good control of your ventilation and air conditioning. If you outfit your room with fluorescent, you will be buying more expensive lights later. If you outfit that entire room with high quality led, you better get your checkbook out and be sure you get something you're happy with.
Just like I said...... heat, yeild, cost. Pick your poison blind, or maybe dabble a bit with each of them before you commit to filling your entire room.