If you are talking minimum instrumentation for basic VFR !
Clock (mandatory)
Compass, Magnetic
Altimeter
Airspeed
As far as what you are proposing, it would seem fairly sensible, with or without the 496.
Ideally if you were worried about Skyview failure you would add a few basic engine instruments such as oil pressure, oil temperature and a CHT. That way you can happily keep flying if your Skyview gives up (it has happened before) or if it's out for maintenance or upgrades. You're not talking about a massively significant cost for that, however it certainly gives you far more options.
With the 496, if the Skyview is out of action and you can handle not having a GPS, no dramas.