His Brain is Gone!
Join Date: Sep 2006
Location: Paoli, Wisconsin
Bikes: RANS Stratus, Bridgestone CB-1, Trek 7600, Sun EZ-Rider AX, Fuji Absolute 1.0, Cayne Rambler 3
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They will all be of comparable quality, using many of the same parts, with the higher priced models probably having slightly better parts in a few places.
They will have slightly different geometries, so some may be more comfortable to you than others.
And you may like certain bike shops better than others.
I would go with the one that has the best combination of riding comfort plus your confidence in the bike shop. If you go Trek, then I would lean toward the 7100 over the 7000 due to better overall parts quality.