For me it's gotta be Dune. I'm using it just as much as sylenth and my virus
sundrip
Toxic Biohazard
Vernon Wanderer
IL Harmor
clay
reasons subtractor, malstroem and thor. together they can do almost anything. subtractor is awesome for baselines and acid and some lead sounds, malstroem is great for weird efex and thor is great for everything else (pads, leads).
cryophonik
Diva.
j/k
I'd probably say Tone2 Saurus. Seems like it hardly gets mentioned, but I find myself going to it in every project for basses or pads, arps, leads, etc. It seems like such a simple synth, but it covers a lot of ground and sounds good doing it, too. Not too bad on the CPU, either.
tehlord
KarmaFX
scorpradio
Gladiator...it's a memory hog but I find it very useful. So much that I dont even use sylenth 1/2 much anymore.
Teezdalien
Madrona Labs' Aalto. There's really nothing else quite like it.
