Thanks everyone! I have the Rhythm II and like them, but wore them out in about 4 months with the high intensity cardio. I use the Ryka Light XT for weights - those will last longer. I just got the n-gage ones, but liked them the first night, then my arches seem to get sore and cramp a bit - I have to stretch them a lot.
May try the Affirm
Also interested in the Ryka N-Gage Instructor - looks a little lower on the ankle, and it's supposed to be for instructors, so it must be nice and cushiony??
Thanks again