I'd put in for two items:

First, an extra antenna for a handheld COMM (or NAV/COMM). Yes, you can get a short extension and put the antenna up somewhere high (e.g., "sunroof" panel), but it will work best with a real antenna, grounded and away from the engine.

Second, a factory option for a Garmin SL30 would be nice. Since Dynon can display CDI info from the SL30, this makes a good package. This would make it easier to follow ATC instructions like "follow the XXX radial" / "intercept the YYY radial".

Doug