I like the PS Engineering PAR200B, with the remote mounted Trig radio, obviously for space. So in the meantime, adding just that will give me an intercom, 2nd Radio, and audio panel in one install.
Bingo. I don't have any nav in my airplane because I don't fly in the clouds anymore. But when I was looking for a second radio I picked the PAR200. Audio Panel, Radio, and Intercom all in one is perfect. It also adds Bluetooth reception so I can listen to my music.
Next will likely be an engine monitor. I'd love to more easily control fuel flow, leaning, etc.
That would be a great upgrade. Get rid of all that stuff over on the right panel.