OK all you radio gurus.....voice your opinions

You gave me good dope on the ground plane....now I stand and look down on my instrument panel and I can only think of those Electronic Warfare jets with the big suacer on top ....
Stuffed into a cubic foot of space is....
Radio
Tranponder w/Encoder and 6 feet of wire bundle coiled under the enccoder.
3 GPS Antennas on top above the encoder ( 302, CN, and CNv)
ClearNav
ClearNav Vario
CAI 302
Portable Flarm

maybe I should install a fire extinguishing system.....seriously now..
anybody see any issues of electronic interference between units. The Transponder will be used mainly at home with all the business jets around.
Thanks for you help.
H