Minimalist shoes for wider feet - suggestions?

I'm beginning to lay base for a full marathon next April, and thought that this (low mileage period) might be a good time to experiment with a more minimal shoe (I want to strengthen both feet generally, and my right ankle in particular after a skiing injury suffered a few years back).  The problem:  I've got low arches and wide feet, and have been having a heck of a time finding shoes that will work.

Current shoes - Pearl Izumi Syncro Float III; Nike Structure Triax 12 (mostly retired)

I tried on a Brooks Pure Flow last night, and while the width was right, there was some interference at the ball of my foot with some of the reinforcing webbing that I could foresee getting really annoying within a few miles

I also tried on a Saucony Kinerva 2, but my right arch seemed to collapse down onto the midsole, making even walking around the store uncomfortable.

Looking for something lightweight with minimal to moderate ramp - I'm not ready for a 5 fingers/trail glove/Hatori just yet.  Any other suggestions?

Thanks!