I have a marathon coming up at the end of the month and I'm at a lost of what shoe to go with. I was aiming on using the Saucony Fastwitch 6, but my left arch hasn't been agreeing with it lately. Fighting this recent bout with PF, I've found that my Altra's help alleviate the pain but I'm afraid to run a marathon in zero drop shoes. My feet are somewhat flat and very wide in the forefoot. I ran my last marathon in Saucony Grid Type 5's, but I want more support for this go around. Any suggestions would be greatly appreciated!