First, I don't care for touch
screen electronics.
Terra Nova has a
Furuno monochrome
radar because
Furuno makes good radars and because West
Marine had their display unit on
sale for $1,000. It is unimportant that all
electronics be from the same maker. Her
SSB radio is Furuno only because I happened to find a deal on an unused one from a private party. The rest of her electronics either came with her or were used take-offs that I had salvaged. Even her
electrical distribution panel had an additional column of breakers added, courtesy of a take-off panel.
It is uncommon, perhaps impossible, on even the most expensive and tastefully done yachts, to find all matching brand electronics. Nor is it desirable to restrict your choices to only one brand.
Through your own due diligence, discover which companies are best at each electronic specialty. For example I would trust
Icom VHF, Furuno
radar,
Garmin GPS, etc. Then watch for a deal.