I am a guitar player first, but w/ an addiction to classic synth sounds and odd pads and drones. I'm more inclined to listen to Kraftwerk, Depeche Mode and Nine Inch Nails than guitar music most of the time.
My first stop is usually the synths bundled w/ my DAW and I try to stick to them as often as I can. But I still have a couple of 3rd party which are hard to replace.
Steinberg's Retrologue. It won't do the over the top stuff that Diva and others may do, it doesn't have a built-in arp or sequencer, but for analog-type of synth sound, it's one of the very best I've heard. Clean but warm and vibrant. I don't usually recommend buying plugs from Steinberg, but that one is a true gem, and only $50.
Besides that, the Cakewalk synths (
Rapture, Dimension and Z3ta) I still use quite a bit - for anything evolving or odd or on the harsh side, they're still my go to. Z3ta is quite a monster synth.
Did you check the Korg Legacy stuff? I've had them on my watch list for quite some time. They're also very attractively priced, like $50 a piece or under $200 for the whole bundle (M1, MS-20, PolySix, etc...)