If you're aiming for 50-60w/sq.ft @ 47.5 sq.ft, you'll need between 2375 and 2850 watts. Like MistaRasta said, run two 1000's. If you plan on using every inch of that space (and why wouldn't you, lol) and if you can cool them, three 1000's would have it jumping. But that may be a lot of heat.