teks are pretty good, but for the little extra money, id go with an aquactinics fixture, because the par is generally better than teks. the 4' tx5 fixture has 5 bulbs (this fixture is on my 55 and it really kicks butt) and the solar flare has 6 bulbs that are powered by icecap ballasts and the bulbs run at about 84 watts or so. if you wanted to go with halides, you could probably get away with 175 watt bulbs, as the 75 is not very deep, and most light demanding coral are usually kept higher up in the tank anyway. the aqualight pros are pretty popular.
-Justin