i'd rather have this one here-
if i was trying to pinch pennies. even with this fixture you'll have to change out the lamps (you would have wanted to with that fixture you posted as well...). high PAR lamps like ATI or giesemann will run you about 20 bucks a piece.
if i was considering a reef, i would go at least 6 lamps for your tank. i wouldn't be concerned with 2 cords, but i don't think you would be able to utilize a 6 lamp hydroponics fixture over your tank because of the dimensions.
hydroponics fixtures don't have to "fit" anywhere special so they make the reflectors larger and hence the fixture is wider. the thing i like about them is they sell them by lumens, unlike aquatic fixtures, and also because they are generally cheaper. they still use identical parts though. (from what i have seen the difference between the tek 6 bulb aquatic fixture and the tek 6 bulb plant fixture is that the aquatic fixture has 2 cords. they are otherwise identical)
so, you should look for a 6 lamp T-5 HO
fixture. current, or sunlight supply are both middle of the road fixtures that will do the job effectively.
if you look on ebay, you might find a 6 bulb current nova extreme pro for a discounted price. i believe current sells their refurbs there.