I am in the same boat Brother! I have decided to go with a Sugino RD Crankset and a 48t. Messenger Ring with a few options to play with in the back 14t., 16t. and 18t. Check out the Bareknucklebrigade.com and look for the Calculator. It was pretty helpful. The specific link was located in the Gear Ratio Question on Page2.

Take Care,

PF