KMII[Montblanc Moderator]
50631
Some additional suggestions…
The Grand Seiko SBGM might give you the complication you want in a very understated and very reliable package:

Now if you want something aviation inspired but without a chronograph, finding a vintage Minerva Pythagore Aviation with its Cathedral hands could be an unconventional choice…

As for a very subtle GMT complication, a Ming 17.03 is also a contender. They are no longer made and with your budget it would be more of a conventional titanium case instead of this heat blued one but it’s a stealthy, versatile GMT contender.