I just went from a 13/28 to a 13/32 cassette, and practiced a little more cadence with teh 6 mph climbs. MUCH more comfortable to make 65 turns than 55 or so turns on our (some would say meager) local climbs. I think my 52/42/30 triple is going back on this bike. With the 28 my bottom gear was 32 inches, with the 32 it drops to 27 inches (16% less), and with the addition of the triple I can get down to 25 inches (another 6%). If I "max down" the granny to 26 teeth, I will have 22 inches, a total improvement of 31%, and I think I have all the parts on hand.
Will have to try this ...