If in doubt, eliminate the bikes that can't take a 38mm tyre (a fast premium 38mm like a Marthon Supreme is probably optimum for general riding and commuting) with a fender. That would be the Sirrus gone at least. Other than that, don't worry. Just buy the bike that feels right and comes from a bike store you trust. The bikes will be built to much the same standard in their Taiwanese? Chinese? factories, but the store does final assembly and will fix problems.