i'm thinking 1200hps, my miss's will kick me out if lecky bill is too high L.O.L.Probably won't need the CFLs, mate. HPS kick fucken ass. Long ago I had a 250 watt HPS and would grow solid, single stemmed 18 inch donkey dicks.
Instead of placing CFLs here & there, place mini fans wherever you can (the 6 inch kind). My 250 was hot as hell so I can imagine a 600 would be 3 times as hot.