I don't think that running 700c wheels on that Schwinn would be a problem. Most cantis and v brakes have lots of room for adjustment. It would just give you more room for fat touring tires and fenders.
Both the Chimayo and the Schwinn look like serious touring bikes to me, but I don't see front rack mounts on the Schwinn.
I've bought lots of stuff from The Sultan. Never a problem.