Absynth5 is my absolute favorite,desert island synth,
good at everything:pads,keyboard,drums,glitches,soundscapes,basses,etc.I could produce the rest of my life with it only.
then comes
Fm8 (Fm Basses are awesome)
Monark (probably the most analogue sounding vst ive tried)
Sylenth (well you know its sylenth)
Massive (basses)
Synplant (pads,experimental glitches,acid basses)
Prophet5 from arturia (analogue sounding basses,detuned synths,pads)
Cypher (very good at keyboards and melodic patches i prefer it a lot more than Strobe and Amber)
Fabfilter One(for quick pads)
For drum machines Cerebrum3,Microtonic,Drumatic3
and in hardware Mopho.