The Hagen GLO T5HO fixtures are not bad either, although they are two lamp fixtures so if you want 4 lamps, you'll need to buy two of the fixtures. They will also have only a single reflector for two bulbs. Not sure whether any of the other fixtures you're looking at have individual reflectors.
If you plan on having a canopy over the tank, consider retrofit kits. You'll need to buy all the components separately, (end caps, ballasts, reflectors, bulbs, timers, switches) wire them up and install them in the canopy.
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