Ok cool. I went the LED route and what I found was I could grow fine plants but they were lacking in density. To get an LED setup that would be equivilant to MH/HPS it would have cost me $800 to $1000 Canadian. I upgraded to a new HPS/MH light system which is pretty nice. From all I have read it should really help with yields. It is currently in a 5x5 tent and is dimmable. It has settings for 600, 750, 1000 and 1100 watts. Comes with a timer, MH and HPS bulbs. It also has a hood that as sealed and can be hooked to an exhaust system for cooling if needed. It is also the same cost as the one you are looking for. Just going by what I just went through researching lights and getting many opinions on this site I found the light I put the link in for to be perfect for 4 plants in my space. Hope this helps.
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