You should first either use the shoe fit tool on the Brooks site or visit a local running store for a gait analysis? Keep in mind also what types of issues your falling arches are creating. Depending on your gait and/or injury status, you might be suited for the following shoes: Dyad, Transcend, Addiction, or Beast. These shoes are somewhat similar in their "last" construction but are best suited for different foot types. Again, get an assessment and then go from there.