Ok...first of all, I don't think the ReeFlo comes in a size suitable for your tank, based on my discussions with them.
Barring the ReeFlo, in your size requirement, very few skimmers will beat the Volcano for all-around electrical cost effectiveness and skimming power. Deltec, BK, et. al. are all over-priced and under perform IMO. The one clear positive about the Deltec is getting the SCH. This is a major issue when looking at buying a commercially made skimmer, so please keep that in mind.
If ReeFlo makes a bigger one, how do you know it will perform like the smaller ones?
And if you are going for pure long-term efficiency, it's hard to beat a counter-current airstone skimmer like mine. It draws 120W and pulls out 2 - 5g of nog per day, depending on how wet I am running it. And the "wet" is still so putrid, when I emptied the collection bucket last night, the other two guys present fled the tank room. And it only cost about $600 to build...
If I was going to buy one made by someone else, I would give the Volcano a long hard look.