Unless you have a compelling reason to stay with Adobe, have a look at On1 or Exposure 7. Both have sophisticated masking and many more of the most important PS/LR features. In fact, E7 is almost an exact knockoff of LR with just enough changes to avoid infringement. If you are versant with Lightroom, both of these have a fast learning curve.
Both have non-destructive layers, are Catalog free, have an extensive array of creative presets, RAW editors, keywords, collections, smart collections, have PS/LR plug-in capabilities, etc.
Both can be purchased. On1 is aggressive about creating new versions each year which they charge for. You can skip every other year and not miss anything. E7 offers new versions when they get around to it.
Check 'em out.
Exposure 7,
Exposure X7 creative photo editor and organizer - Exposure Software
On1 Software,
Photo Editing Software | Discover Photography & Picture Editing Software - ON1