I also am interested in a great pair of shoes to de-stress my feet and high arches. I purchased Avia instructor shoes for several years, but they changed the sizing on them a year or two ago. Couldn't get larger than a 10 until last August, but the 10s are too small and the 11s are more roomy than I need. The 10s previously were just right. Bought the 11s and used them anyway, but now I need a new pair since I'm rolling to the outside, which is my cue that I need new shoes. I've looked at the Ryka site and would like to know if anyone has tried both the Re-Alchemy and Supra models or if the cross-trainers were as good as the aerobics shoes. The size info says they run small, but I recently purchased a pair of size 10 non-aerobics Ryka shoes on QVC and love them. I've had plenty of achy feet in my time and want the best fit, cushioning and support available. Thanks for your help.