Hey man just reading this, you say you're slightly worried about the electricity usage and are considering the switch to LEDs. I'm not affiliated with them, nor have I grown with them, I'm still learning myself, but I've seen a few independent grows with their lights, its called the HH pro-grow 400 and it uses 290 watts and the gentleman using it got just under a pound with some autos from nirvana. Not particularly high yielding strains, about 4-500 g/m^2, but they were very nice nuggies, I'll link it.
http://www.growmedical420.com/11627/pro-grow-400-l-e-d-grow-light-wrap-up/ I'm between them, blackstar's 240w or their new 180w chrome, and maybe on down the line I'll pick up a magnum. All these units should run with about 1/3 to 1/2 of the energy it costs to operate an HPS system. Keep in mind these don't compare at a 180watt LED out growing a 600 watt HPS. It will be more like a 290 (true draw) LED will be on par with a 600 HPS. Yield will suffer slightly from what I understand, about 3/4 oz per plant, but if you're vegging these at all, and can pull more weight because of training and veg time, IMHO it's worth it. If you're worried about meeting production standards and want minimal work, ebb & grow would be better with a SOG approach, only have to worry about raising lights once a week, changing rez out, and mixing nutes. That's a lot less hassle than training plants in veg and weaving them through the screen in flower, but I promise SCROG yeilds results like mad. I've seen guys pull 600 g's in a .8m x .8m with CFLs and a screen and 1 plant. Imagine what you could do with higher quality lighting and hydro's growth rate. He vegged 1 month, if you could veg 2, which is how long the plant takes anyways to show sex even if you force flower, (its not mature enough until then,) I feel confident you could 1 up that kind of yield. Just my 2 cents.