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I would disagree with the bike weight importance. 2lbs is huge when you are talking about a bike that only weighs 18lbs. I'm not sure why, but it makes a bigger difference then losing two pounds of weight off the body. (I would absolutely trade 2lbs off my bike and put in a backpack on my back anytime!). I can't say why this is scientifically, but I can definitely feel it.
Do you know which derailleurs these super efficient ones might be? I had a bike with top of the line full Dura-ace, which is the bike I used for comparing to the fixed gear.
Either way, if you can get a bike with derailleurs like those, you will be putting much less effort into moving than the vast majority of cyclists.
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