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ProjectSAM This is the ultimate pack for Kontakt 3+ Versions. The most Epic Orchestra / Symphony Library Samples and Pads on the web! Check out the samples on their website if you are not convinced!
CineSamples This is the award winning music production kit that most Movie Score / TV Score Producers use in their work spaces. Like the ProjectSAM Libraries, the Cinesamples has a multi-variety of Samples, Software, and Libraries.
Komplete 8 by Native Instruments, this is one of the greatest Sample Library Packs ever, and one of the most popular! It's Equiped with over 10,000 sounds over 150 GB of sounds and samples.
Pro Session by M-Audio, the sounds by m-audio which have brought to you ProTools and other AVID related software/hardware, this software is affordable but really high quality in both Sound and Produce.