Ascension
Ascension is a pc & mac compatible 64-bit workstation synth. Awarded 4/5 stars by computer music magazine (issue cm259). With 4 powerful, FM enabled oscillators you can choose any mixture of subtractive, wavetable synthesis and a huge 6 GB rom sound library. You'll also get over 1300 ready-to-go presets along with over 1600 oscillator waveforms and 3400 MIDI loops.
$185