This mix by Von Oswald & Mark Ernestus, donning their Scion guise, is probably the best starting point. It does what it says on the tin.
I'd recommend digging through Basic Channel's discography first if you haven't already, then proceed to check out their seminal Chain Reaction imprint, where they've released mostly other people's music. In any case, Chain Reaction is in my opinion the strongest of all the Basic Channel-affiliated labels. For a more dubcentric approach, see Burial Mix and Rhythm & Sound. Maurizio was their house outlet, also incredibly strong; "Domina" is hands down one of the best house tunes to ever see the light of day. All dubbed out, blissful textures with a groovy bassline and the perfect kick.
There's been a lot of forgettable dub techno releases and labels throughout the years; Giegling's "Staub" series have provided some awesome takes on the genre though. The releases excell in sound design and provide rewarding mixdowns, letting each element breathe as it further unfolds. Another mainstay is DeepChord (10/10 mix incoming).
As Von Oswald once put it, it's all about reduction and repetition. Analogue modulation, little sound fragments, splycing and other happy accidents make or break a dubtechno tune imo, all in the details. Yet since it intentionally never goes anywhere, it's also great to zone out to. As a side effect, you'll hardly find an unlistenable dub techno tune - even the dullest, blandest approach kinda does the trick, which is the genre's bane and blessing.
For more a modern, ambient leaning take on the concept I'd recommend checking out the Silent Season catalogue and related acts (Edanticonf and Federsen are decent starting points). ~scope (by Pole) has also a few decent bits out.
Enjoy your discogs. I'd love to relive the time when I first started digging for dub techno; every new discogs discovery was a fucking revelation.