For high altitude IFR I run a mixture of VFR charts, again under Ozi, or when crossing mountains above an overcast I run a topo map produced from Google Terrain - about 100GB of tiles for the Alps and the Pyrenees. These presentations are intended for emergency use, because an emergency (when you are going to go down) is really VFR
The Garmin 495/695 also contain topography. Do you use the Google data to get more detailed information?