I would also go w/ the MH's. I've had PC's, VHO's, and MH's and my favorite is the MH's. With the size of your tank and the depth, I think MH is your best option. Food for thought: If you like a bluer tank get a 400w MH system. This way you can have the same PAR as a 250w 10K w/ a 400w 15-20K bulb. No matter if you choose 250w or 400w I would go w/ a pendant and a fan (and maybe a chiller depending on house temp., distance above water, etc.). An ATO is a must also. My 10gal. reef has a 175w MH pendant above it (<4" off the water) along w/ a fan controlled by my ACjr. and my temp. never varies more then .75*, but I keep my house in the low 70's. My tank also evap's about a third of a gallon a day.