I ran cooltubes on my 1000 watt HPS's. When hooked to a 6 inch fan, I could put my hand on the glass while it was on.

However, since you already know you wanna end up with LEDs, I wouldn't spend the extra money.

That being said, I also wouldn't use a tent, and block off part of a room. That should help with the heat issue an enclosed tent will give you.

"2000 w" lol...you're ahead of the game already, knowing that what they name a light doesn't mean much as far as actual power draw. Gotta read the specs. That "2000 watt" light probably doesn't push more than 200-250 watts.