ReFX Nexus - awesome pads, strings, atmos. MUST HAVE. ~ 2.5Gb (15Gb with all expansions)
Spectrasonics Omnisphere - 9DVD of cool ambient sounds. omg. Not better than Nexus. ~50 Gb
Steinberg Hypersonic 2 - Nice orchestral pads, kinda strings, woodwinds, ansambles etc. ~ 2Gb
Edirol HQ Orchestral - orchestral, strings synth. ~100 Mb
Arturia Moog Modular & Albino3 really cool stuff, and if u had kinda skills u can do a great things with it, just keep workin.
Space&industrial synth:
ASET Mythospheric
MHC Industrial Tones
Sophia 1.1
I have it all, so if u wanna some of that things just send me PM.