Me personally, would go with the three 600's and if you can get the blockbuster hoods go with them, they're excellent, I use the yieldmaster II 6" hoods, but the blockbuster is just as good if not a better reflector.. that's absolutely going to be a perfect footprint for an area that's about 9x4. If you get the 6" blockbuster hoods you'll also want two 6" inline fans, both working on opposite sides of the tent sucking some air in and pushing that warm air out.
Ideally use Three
Ushio Super HPS bulbs.. they produce a great wide spectrum without sacrificing lumens like a conversion bulb. & they also work fine on the Lumateks when you crank em up into Super Lumen mode.