Mine is Nexus..hands down.
Mine used to be the Waldorf A1, even though it was one of the basic synths that ships with Cubase, I got to know it really well, to the point I could pretty much get any sound I wanted out of it. Unfortunately A1 doesn’t work on OSX Lion, so I’m now looking for a new favourite, I’ll have to give Nexus a try
Yes, In my opinion, Nexus is best…period
Yes, I also wanted to mention Virus, but as vst synth goes it’s MASSIVE from NI. Love to play around with that one
Omnisphere, but I don’t own it yet!