I went with 6x65 watt PCs over a 75, and I'm kicking myself for not going with Halides. The only problem with MH for me is that the heat they put out is unacceptable for the house my tank is in at this time.
150 MH halides frome AquaMEdic and Bresslein. I got them used so they were pretty cheap. I also have some PC's on a smaller tank, and have used everything, inc T5 and lots of NO fluors.
I went with the outer orbit fixture with 2x 130 w pcs and 2 x150w mh over my 75g. The lighting is great but the replacement cost of bulbs is crazy.......now they make this fixture with t5's which those coupled with mh would be ideal if I could build my own fixture .........one of the problems associated with cathedral ceilings......the inability to hang a pendant light.....