If money is not a consideration, then go with the 2 x 36" units (if you're thinking heavy sps tank), since you mention possibly needing 3' units later on. However, this option will cost quite a bit more, in terms of initial cost, bulb replacement & electricity, not to mention the added heat.
If its a mixed reef or mostly lps & softies, go with the 6' light.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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