Appreciate your inputs everyone,
The GNC 250 is a previous investment and never used, afraid I will take a big loss trying to resell. Simply trying to integrate along with today’s technology. Mapping, traffic and communications in center stage for touch screen interface, old school airspeed and altitude, at a quick scan for takeoff and land as a backup if the Dynon ever went dark. Figured Dynon positioned just off line of site would be acceptable. Airspeed equals life which is why I considered it within the panel having never flown with a glass airspeed indicator. If I can sell the GNC 250 I would have a clean slate to go for the Skyview system. AmFm CD player was a previous plan too, but why, considering all the newer alternatives. Can anyone suggest the best marketplace for reselling avionics for the hombuilder? The inflight video of the Dynon 180 from DessertFox is very impressive for consideration!

Thank you all!