First of all let me say I dont use power compact lights. I prefer VHO driven by Icecap ballast, but I will concede that Power compacts are a little mote cost effective on smaller tanks like your 29. I ran 4 normal output expensive aquarium bilbs on mine back before I upgraded to larger tanks and if I had know about
www.ahsupply.com I could have had a whole lot better light for a little more than I wound up spending. The lighting yyou mentioned, I have seen advertisments for but where are you gonna get a replacement bulb if one blows out(Hint, no matter what you chose, always have a backup) The 55w and 96w bulbs from AHSupply use std pin configurations, not sure about the Lazers.
As far as Metal Halide goes, if you do SPS or Tridacnid Clams go for the 250w Iwasaki 6500K and fans(thermocontrolled fans are a good idea anyway)
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I'm not going to wake you, I'll go easy on your heart
I'll just touch your face and drift away , like smoke rings in the dark