Given that the OP lives in AZ where there is some real climbing, I'd give a long hard look at keeping the triple set up and going with a half step and a granny (say 52/47/37)(37 being the smallest you can go on a stronglight 93) with a wide ranging freewheel in the back. Alternatively get the 42 tooth triplizer and go with a 52/42/30 plus a decent sized freewheel in the rear. I'd lean towards the triplizer because the gear shifts will be more straightforward than with half step gearing. Just my 2 cents worth.