I have an GEM Equinox 76 for general type sounds, as well as thick pads.
http://www.synthmania.com/equinox_61.htm

I also have an old Proteus FX for orchestral type sounds

For analog-synth type leads, bass, pads, I use an Alesis Micron.

Had my run of Korg/ Roland / Yamahas, but got really tired of them. The best of the lot was probably the Roland JD800.