Flat feet?!?! Who said anything about flat feet?
I'm 5'8" with an inseam < 30". I'm fine with tippy toes or one foot at a stoplight. But a 42" seat height! I think I'd have to put the sidestand down at lights. I'll probably go with the Hyperpro. I'm toying with a lower shock because for the riding I do, I think the confidence from a lower seat height would actually outweigh the loss of travel. My bike is likely getting close to 400 pounds, and it gets a bit unnerving on off camber or really rocky trails. I can only think of one time where I even came close to using all the suspension. Even then, I don't think a 1" lower shock would have made much difference, but the lower seat height would have been comforting.