With your aquarium only being a 29gal you could settle with a Hang on the Back Skimmer like the Remora.
But a sump is by far more better since it gives you a place for a skimmer, heater, more water volume and a place for more LiveSand and LiveRock.... If you can afford it then go with a sump.
The Metal Halides that I looked at only had 1 bulb.
As far as PC lighting I love my Orbit, The actinics come on at 8am the the Daylight 10,000k and 6,700k bulbs come on at 10am then they turn off at 6pm and then the actinics turn off at 8pm then the Lunar lights come on for a full Dusk to Dawn setup. I haven't heard anything about them breaking.