I'd go the very simple basic instrument approach if I built mine
again. The only real addition would be an attitude indicator.
I have a very IFR panel now, with vac system, glideslope, marker
recvr, etc. It was in hindsight an enormous waste of money because
the plane is not a good IFR platform, so I don't fly it IFR.

Of the stuff invested in the panel though, I really like my Bendix
King KX-155 which has to be one of the best pure radio's I
have ever used. Crystal clear and range goes way way WAY
out. Not a lot of features but a REALLY solid radio.

I have a GNC-250XL, which is a great GPS Comm, but took me
a week of flying it on the desk at home with external power in
simulator mode to learn the features. Radio in it is good, but not
as good as the KX-155

Jeff