My recommendation is to try the Nike LunarGlide 4s. I have flat feet, too, and these work just fine for me. If you really want minimalist shoes, try the Free Run 3s.
Yonex VCORE Tour 89 w/ Volkl Cyclone 18 @ 48
Yonex EZONE Ai 98 w/ Yonex PolyTour HS 125 @ 45