How much money do you have budgeted for a bike? I'd bet lots of folks can give you ideas of new bikes that might meet your needs AND your budget. (when you have a specific type of bike in mind, it can be hard to find the perfect one used)
$1,000 or so (or less!) can get you a perfectly good touring bike in steel.
$750 or so can get you a perfectly good touring/cyclocross bike in aluminum. For example the http://www.konaworld.com/09_dewdrop_en.cfm The Kona Dew line has lovely stable "do it all" geometry. The Dew Drop is outfitted for road.
(Oh, and do take a look at cyclocross bikes. Some of them are running around as tourers and commuters, too. My utility bike is a cyclocross bike, Surly Cross Check.)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson