Have a look at MGL
8.5" iEFIS Lite $2850
RDAC for your engine $375
SP6 Magnetometer $260
Total $3485
Add 2 autopilot servos $1900
I'd go for a remote radio and transponder (mine are Trig) but you'll have to see what those cost in the US as I don't know.
Obviously the EFIS has a moving map but if you wanted something separate (that can also be loaded up with some form of nav software) then look at the Guardian Avionics panel mount for an iPad (or mini). Looks much better than an ugly RAM mount sticking out of the panel