Mistique indeed has a huge catalog with al sorts of styles, prog, ambient, breaks and some trance. It's almost impossible to start but like Katadunkass said, just find an artist you like and filter from there. Then via remixes you'll widen your scope. Many artist have their own productions and remixes on this label.
Timewave - Many great remixes and releases from him on this label. His album War (MIST266) delivers many styles.
Deep Fog - Remixes and there own album Wave (MIST212).
Others: Relaunch, Deep Soul Duo, Loquai, CJ Art, Horizons, Kay-D (too many tracks to name).
Some more favorites of mine:
21st Street - Pray For God (Subtara's Progressive Remix)
Timewave - Against The Wall (Gary Delany Remix)
Gary Delany - Evanescence (Timewave Remix)
Sound Fusion vs Alex Rusin - Shadows Of Us (Alfredo Calderini Remix)
Jeremy Rowlett - Vanilla Skies
@Katadunkass, your right about Exoplanet. Very underrated producer!!