Absolute 6

Tons of excellent sounds. Not on the level of Native-Instruments or Spectrasonics though but great value. Some of the samples, especially beats, seem a bit "oldish" but rest of the package (Halion, Groove Agent) really fill every need one might have. Not as comprehensive as Komplete from NI but doesn't have that much of overlapping sounds either.

Have been using Absolute 4 and now upgraded to 5. If you have Absolute 4, there might not be that much need to upgrade.

2022 update : unfortunately Absolute is not (yet) available with Steinberg Licensing so you still need to use the dongle to use the VSTis.