i have the sun systems super sun for my 250w metal halide. i wouldnt use it for a 600 cause its kinda small. i use it in my veg box which is 26"x34"x42" and is it great, just wouldnt want it for my flowering room, especially the size ur using. so hm let me look here. I would either roll with the Silverstar cause it will be very easy to vent and comes with glass and shit. Or the sunlight supply super sun II but that one is kinda expensive. The cool breeze 6" reflector is cool cause it incorporates a standard rectangular reflector into a cylinder. the sun gro reflector is cool cause its a square and would fit your growing area perfectly. but it looks like hard to vent. overall i would run with the silverstar or the sunlight supply supersun II. hope my advice helps.