Originally Posted by
bmthom.gis
THere's probably nothing wrong with your mesa runner for a touring bike. Maybe find some better components for it, but schwinn has been known for making some pretty darn durable bikes. Other potential options I would seek out are mtbs from teh early 80s (not sure what year yours is) - but there were a fair number that had more road bike sized frames then (Ross for sure had some larger geometries). But if your Schwinn fits, I would go with that. You likely won't get any better quality from buying an old Hardrock, at least component wise, except you would be getting Shimano instead of what I am assuming is Suntour.
How about some pictures? We can't really help you decide without seeing what you are working with.

Here is the 'ol Mesa Runner. Shimano Z202 front Derailleur and Shimano Z501GS on the rear and has Shimano MT50 thumb shifters. This bike is the bottom of the line up that top is the Cimarron and it has Shimano Deore XT components. I see a lot of those Deore XT components on ebay...should I get them and upgrade?