ok there all good but there has to be better. the koga has a problem and that's in the the way the head set is made,well not so much a problem but the average cyclist would have problems trying to fix it.
the surly is good from what i see, well it's popular probably because it's cheap enough for the average man /woman to buy.
depends what touring ,well a bike that can handle anything it's come's across .it should climb well/ it should be light with no flex when loaded,and it should be affordable.