Why not have the Stratux regardless? What if the panel starts making smoke and you need to switch off the master? Stratux and iFly on their own batteries will not only let you keep navigating but will steer you to the NRST airport.
L3 Lynx 9000 also looks pretty good. It's on sale right now, and I'm really tempted. It would be great to see some pictures of what weahter and trafficx look like on the iFly.