My comment is, that if you are starting a kit later this year, it is way too early to worry about avionics. Fun to dream, though!
I know the GRT HX and HXr integrate with, and can control, the Trig TT22. I do not know about the Garmin.
As to an antenna, any transponder antenna should work okay.
One thing you didn't mention is ADSB-in. Garmin pretty much works with Garmin; there's a wide range of manufacturers that work with GRT (I use Skyradar for -in).
IMHO I think once you get ADSB-in you won't want to pay XM $35/month anymore.
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