i am currently working on building a 120g reef system, but this is my first "big tank" build and i am looking for some advice for the equipment i need. I am planning on having a simple but nice LPS set-up and maybe some SPS down the road with some tangs, chromis, wrasse and other common reef fishes. My tank is a standard 120 and i am planning to use a 40g breeder as my sump. The lighting system i got with the tank is a 750w (2 double ended halides, 4 compacts). My main question is concerning the return pump, how many gph should i be looking for, what is enough and too much, and what brand? I don't know the exact head height right now but it will be 3-4 ft. Then again i am confused with skimmers. I have talked to a lot of people and they suggested ASM, the guy i bought the tank from said he ran a G-3 for his reef and the guy at the lfs said a G-1X would be plenty. Any suggestions on this? thanks.