2 or 1, which is better?

i am soon going to get some materials together to set up a 5'x6' and 8' tall ceiling room.. i was thinking about lighting and i was wondering what would be better for my space.. 2-600watt hps lamps or 1-1000watt hps lamp.. i will be using digital ballasts because from what i've read they are the best.... also i will be cooltubing those lamps in order to keep heat down..
I will be growing about 12 plants in there and sstart flowering when they are about 12" (1ft) tall

bump.......

go with the 2-600's for sure, you only use a little more power and will get another 40 k lumens, plus you willl yield more having 2 points of light, i use 2-600's in a 5x5 area and the light coverage is blinding, plus the 600's can be hung closer to the plants so they will recieve more light

I'm gonna go with the crowd and say 2x.

I did a dual 150W then got a 400W. I feel I did slightly better with the dual 150W.

(just a footnote, 600W bulbs are an odd beast. 400 & 1000 are easy to come by locally. Get an extra one for just in cases)

Definately go with 2 x 600W's. No doubt about it.

I think ya got ya answer now and I have to agree with everyone else and say go the 600s. You wont be disapointed.

awesome thanks guys.. it all won't be used to grow tho i'll have my water res. and a dehumidifier and the basic stuff like that so..so i'll have more than enough light for my space?.. because i want awesome bud