The conquest and the cross check are not going to offer the advantages of the LHT. The LHT will give you the ability to be more upright. I don't know about the others. I would go with the Surly LHT, hands down. Have many friends on LHT's with a variety of handlebars - drop, moustache and swept back. Read the Bike Hermits post on bike fit that will help you out re size. Of course also go to the Surly owners forum. In the long run, I think you will be super happy!
Sky King
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Gilles Berthoud "Bernard"
Surly ECR "Eazi"
Empowering the Bicycle Traveler
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