In terms of sound quality, current draw and overall reliability the Walter Dittel radios of every generation seem to be a little better than the last three generations of Beckers I've dealt with. We have a number of both makes in the club and private gliders at my field. None of them are 8.33 models though.

We have one Peiker boom microphone installed on a club ship. It's decent quality in terms of how rugged it is and how well it stays where you put it but it's a definite step below the quality of the Becker and Dittel boom microphones in that regard. As far as I can tell the Trig isn't compatible with the Becker and Dittel microphones so the Peiker is the one that Cumulus Soaring offers with that radio.

The Air Avionics one looks interesting but I have a personal rule about never buying anything in it's first iteration and that has worked out well in the past when it comes to avoiding aggravation. Once it's proven it could be a good choice especially if you want to have a Mode-S transponder and have limited panel space.