I just wanted to quickly mention a little secret that perhaps some have never thought about. If you own both Absynth and Alchemy and Kontakt (some 3rd party instruments) you have entire libraries of useful sounds you can use.
On a Mac you can find all these nicely organized under Library/Applications Support/Company Name/Samples
On a PC you should go to the directory for the plug in and I presume look under samples.
Secret - Nothing prevents you from using the samples from one plug in in another.
I know many people just tweak presets but if you are adventurous enough to build from scratch or change samples in a preset your sample library is a big as all the collective samples from your plug ins.
If you own IRIS you can also import all these into IRIS.