Michael
If it helps, I had a 60cm (double top tube) Sam, and sold it because I thought it was just a bit big for my 89cm pbh. While I regret selling now, I know I'd have preferred the then optional 58cm Sam.
Now that I'm riding more off-road, and appreciate the clearance, I'd likely go for the 57cm size (and am so tempted to, if I wasn't just finishing building a Clem L).
The new Sams are so nice. Enjoy!
- Chris