How much of a difference would one notice in 1.9 gear inches, climbing wise? I am looking at two different cranks, one of which gives me a low of 20.2, and the other a low of 22.1. I can't go higher on the cassette without changing out the derailleur, and if it isn't such a big deal, I find the middle gearing on the crank that gives me 22.1 at the lowest to be more useful (plus the all important it looks better).

Also, what differences would I notice in going from a 170 to a 175 crank arm, if any? I have no specific reason to make the change, other than price difference, at the same time this bike is the only one of mine with a 170, everything else being 175.