Originally Posted by rms13

Swift is aluminum/carbon fork the others are steel. That's mainly a preference. The kilo has Reynolds frame which among the steel options is considered slightly better and the components are a little better for the extra $100.

Swift vs the Hour would basically be aluminum vs steel. I think cheap steel frame is generally better then cheap aluminum as far as ride quality goes. Don't get caught up on fixed vs freewheel as long as the hub will take both. You can buy a fixed cog or freewheel for $10-20