PM, FM, or even Substractive or additive... whatever. Synths that can produce classic, or hybrid (similar/hybrid/Physical Modelling included) sound.
Synths that even not having the capabilities to produce a kind of sound, can emulate it via modular means or matrix methods or you name it.
I am looking for a bread and butter synth(s), BUT also with the capabilities mentioned most to fill in a mix and able to do all this. Having multicore,oversampling, custom waves, etc... would be a plus, but not exactly needed. It is valid even if its old.
As an example I can say Synth1... because I am able to do great basses (accoustic or not) and good strings/pads.
M-theory, even being a PM synth I managed to get some good sounds from it (trumpet, guitar, with SF2 quality (not sampled but sounding very good to my ears) using LFOs, the exciters and filters).
RMXL, tweaked it a lot and made a spanish guitar sound with it (After 4 hours). I am a bit embarrassed to post the sounds but that is for another thread... but I promise you I will post it

Oatmeal... Still tweaking it, but it shows promise, and the fact that you can Draw or make waveforms makes it quite powerful not just for sinthy sounds.
Oxe FM... just learning it but sounds well (a bit difficult gui for me).
Of course IF you think a synth can do all kind of sounds, your welcome to name it...
I hope I explained well... thanks to all.