Simple fact , you need 2, one on primary, one on guard.

There is no other way !!!!!

Dynon Skyview is definite ADAHRS already on its way since it needs to be fitted in the back.

A Garmin GTN635 GPS/Map/Com is possible. It gives me a TSO'd GPS signal for ADS-B out even though that isn't mandatory just yet. It also gives me a backup moving map, along with the iPad, so it isn't really necessary

Transponder? Must be mode S extended squitter mandatory from Feb 2014. Dynon is possible. it is managed through the Skyview display. So would a Garmin GDL23 remote - managed through the GTN 635. Or a Stand alone Trig.

Second radio? Yes. Icom 210. Probably a Garmin audio panel as well.

ADS-B in would be nice, but it doesnt show much GA traffic - yet and Dynon doesn't support the International system - yet.

Magnetic Compass, 3 inch airspeed and altimeter already purchased for when the electrics fail.

I've decided I'm not into teeny weeny gauges and LCD displays, fat fingers and turbulence makes then difficult to set.

I would look at the Icom 200 rather than the 210. Look at the way the 210 is mounted and you will see what I mean. :ok: