Not trance, but how about biosphere. He came into town a long time ago. Also some nice relaxing stuff would be susumu yokota. And not forgetting brian eno's music for airports.
And, amazingly, muji is selling some rather relaxing wall music.
they're not really ambient trance though, but really good as a after party come down.
If you're into old school ambient, then maybe terre thaemlitz would be great too. A label to look out for would be instinct records ambient releases from the 90s.