For the soft synths, get kazza lite, and download as many as you can. You can never have enough vst plugins. But the ones you should look out for are:-

Native Instruments- Absynth, Pro 52, FM 7
ReFX- Beast, juno x2
Spectrasonics - Atmosphere
Waldolf - PPG Wave 2, Attack
Sonic Syndicate- Junglist
Stienberg - Halion