I was thinking the 52 cm frame would be about right as I ride a 54 cm road bike frame and I've read several threads that you should order a frame 2 cm smaller than your standard road bike.

Scott, Personally, I like a touring bike with a larger frame size, not smaller than a standard road bike. That way I get longer wheelbase and chainstays and fork rake too; more stability descending swiftly under heavy load, the bike is less likely to lose control if load is not balanced, and a more comfortable ride, think Cadillac soaking up every road bump, instead of bouncing along in a VW Bug.

On the other hand, bigger frames lose efficiency and agility but touring is not racing. My racing bike is 2 inches shorter than my touring. 38 inch wheelbase racing, 42 on the touring. The racer is fun and agile, the touring bike boring, stable, comfortable.