So what type of flying do you intend to do. In my Pitts Special, the SL40 would be all that I need. It can handle the Comm and intercom. Don't need a VOR, LOC, or GS.

If you intend to fly approaches, then I will suggest one of the moving map, all in one boxes like the GNS-430 and its peers gives you all of the nav and comm that you need and then you can add something like a SL40 for a second comm. With only two boxes you do not need a talented and expensive audio panel like the GMA-340.

All of the current generation of boxes are light weight and draw only a little power. You did not ask, but you only need a 70W alternator if you have multiple landing and recognition lights. These days the avionics and the LED interior lighting has drastically reduced the electrical system power requirements.

So the question is, what kind of flying are you going to do.

Best of luck,

Wes
N78PS